1 /*
2 * Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 // no precompiled headers
26 #include "classfile/classLoader.hpp"
27 #include "classfile/systemDictionary.hpp"
28 #include "classfile/vmSymbols.hpp"
29 #include "code/icBuffer.hpp"
30 #include "code/vtableStubs.hpp"
31 #include "compiler/compileBroker.hpp"
32 #include "interpreter/interpreter.hpp"
33 #include "jvm_bsd.h"
34 #include "memory/allocation.inline.hpp"
35 #include "memory/filemap.hpp"
36 #include "mutex_bsd.inline.hpp"
37 #include "oops/oop.inline.hpp"
38 #include "os_share_bsd.hpp"
39 #include "prims/jniFastGetField.hpp"
40 #include "prims/jvm.h"
41 #include "prims/jvm_misc.hpp"
42 #include "runtime/arguments.hpp"
43 #include "runtime/extendedPC.hpp"
44 #include "runtime/globals.hpp"
45 #include "runtime/interfaceSupport.hpp"
46 #include "runtime/java.hpp"
47 #include "runtime/javaCalls.hpp"
48 #include "runtime/mutexLocker.hpp"
49 #include "runtime/objectMonitor.hpp"
50 #include "runtime/osThread.hpp"
51 #include "runtime/perfMemory.hpp"
52 #include "runtime/sharedRuntime.hpp"
53 #include "runtime/statSampler.hpp"
54 #include "runtime/stubRoutines.hpp"
55 #include "runtime/threadCritical.hpp"
56 #include "runtime/timer.hpp"
57 #include "services/attachListener.hpp"
58 #include "services/runtimeService.hpp"
59 #include "thread_bsd.inline.hpp"
60 #include "utilities/decoder.hpp"
61 #include "utilities/defaultStream.hpp"
62 #include "utilities/events.hpp"
63 #include "utilities/growableArray.hpp"
64 #include "utilities/vmError.hpp"
65 #ifdef TARGET_ARCH_x86
66 # include "assembler_x86.inline.hpp"
67 # include "nativeInst_x86.hpp"
68 #endif
69 #ifdef TARGET_ARCH_sparc
70 # include "assembler_sparc.inline.hpp"
71 # include "nativeInst_sparc.hpp"
72 #endif
73 #ifdef TARGET_ARCH_zero
74 # include "assembler_zero.inline.hpp"
75 # include "nativeInst_zero.hpp"
76 #endif
77 #ifdef TARGET_ARCH_arm
78 # include "assembler_arm.inline.hpp"
79 # include "nativeInst_arm.hpp"
80 #endif
81 #ifdef TARGET_ARCH_ppc
82 # include "assembler_ppc.inline.hpp"
83 # include "nativeInst_ppc.hpp"
84 #endif
85
86 // put OS-includes here
87 # include <sys/types.h>
88 # include <sys/mman.h>
89 # include <sys/stat.h>
90 # include <sys/select.h>
91 # include <pthread.h>
92 # include <signal.h>
93 # include <errno.h>
94 # include <dlfcn.h>
95 # include <stdio.h>
96 # include <unistd.h>
97 # include <sys/resource.h>
98 # include <pthread.h>
99 # include <sys/stat.h>
100 # include <sys/time.h>
101 # include <sys/times.h>
102 # include <sys/utsname.h>
103 # include <sys/socket.h>
104 # include <sys/wait.h>
105 # include <time.h>
106 # include <pwd.h>
107 # include <poll.h>
108 # include <semaphore.h>
109 # include <fcntl.h>
110 # include <string.h>
111 # include <sys/param.h>
112 # include <sys/sysctl.h>
113 # include <sys/ipc.h>
114 # include <sys/shm.h>
115 #ifndef __APPLE__
116 # include <link.h>
117 #endif
118 # include <stdint.h>
119 # include <inttypes.h>
120 # include <sys/ioctl.h>
121
122 #if defined(__FreeBSD__) || defined(__NetBSD__)
123 # include <elf.h>
124 #endif
125
126 #ifdef __APPLE__
127 # include <mach/mach.h> // semaphore_* API
128 # include <mach-o/dyld.h>
129 # include <sys/proc_info.h>
130 # include <objc/objc-auto.h>
131 #endif
132
133 #ifndef MAP_ANONYMOUS
134 #define MAP_ANONYMOUS MAP_ANON
135 #endif
136
137 #define MAX_PATH (2 * K)
138
139 // for timer info max values which include all bits
140 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
141
142 #define LARGEPAGES_BIT (1 << 6)
143 ////////////////////////////////////////////////////////////////////////////////
144 // global variables
145 julong os::Bsd::_physical_memory = 0;
146
147
148 int (*os::Bsd::_clock_gettime)(clockid_t, struct timespec *) = NULL;
149 pthread_t os::Bsd::_main_thread;
150 int os::Bsd::_page_size = -1;
151
152 static jlong initial_time_count=0;
153
154 static int clock_tics_per_sec = 100;
155
156 // For diagnostics to print a message once. see run_periodic_checks
157 static sigset_t check_signal_done;
158 static bool check_signals = true;
159
160 static pid_t _initial_pid = 0;
161
162 /* Signal number used to suspend/resume a thread */
163
164 /* do not use any signal number less than SIGSEGV, see 4355769 */
165 static int SR_signum = SIGUSR2;
166 sigset_t SR_sigset;
167
168
169 ////////////////////////////////////////////////////////////////////////////////
170 // utility functions
171
172 static int SR_initialize();
173
174 julong os::available_memory() {
175 return Bsd::available_memory();
176 }
177
178 julong os::Bsd::available_memory() {
179 // XXXBSD: this is just a stopgap implementation
180 return physical_memory() >> 2;
181 }
182
183 julong os::physical_memory() {
184 return Bsd::physical_memory();
185 }
186
187 julong os::allocatable_physical_memory(julong size) {
188 #ifdef _LP64
189 return size;
190 #else
191 julong result = MIN2(size, (julong)3800*M);
192 if (!is_allocatable(result)) {
193 // See comments under solaris for alignment considerations
194 julong reasonable_size = (julong)2*G - 2 * os::vm_page_size();
195 result = MIN2(size, reasonable_size);
196 }
197 return result;
198 #endif // _LP64
199 }
200
201 ////////////////////////////////////////////////////////////////////////////////
202 // environment support
203
204 bool os::getenv(const char* name, char* buf, int len) {
205 const char* val = ::getenv(name);
206 if (val != NULL && strlen(val) < (size_t)len) {
207 strcpy(buf, val);
208 return true;
209 }
210 if (len > 0) buf[0] = 0; // return a null string
211 return false;
212 }
213
214
215 // Return true if user is running as root.
216
217 bool os::have_special_privileges() {
218 static bool init = false;
219 static bool privileges = false;
220 if (!init) {
221 privileges = (getuid() != geteuid()) || (getgid() != getegid());
222 init = true;
223 }
224 return privileges;
225 }
226
227
228
229 // Cpu architecture string
230 #if defined(ZERO)
231 static char cpu_arch[] = ZERO_LIBARCH;
232 #elif defined(IA64)
233 static char cpu_arch[] = "ia64";
234 #elif defined(IA32)
235 static char cpu_arch[] = "i386";
236 #elif defined(AMD64)
237 static char cpu_arch[] = "amd64";
238 #elif defined(ARM)
239 static char cpu_arch[] = "arm";
240 #elif defined(PPC)
241 static char cpu_arch[] = "ppc";
242 #elif defined(SPARC)
243 # ifdef _LP64
244 static char cpu_arch[] = "sparcv9";
245 # else
246 static char cpu_arch[] = "sparc";
247 # endif
248 #else
249 #error Add appropriate cpu_arch setting
250 #endif
251
252 // Compiler variant
253 #ifdef COMPILER2
254 #define COMPILER_VARIANT "server"
255 #else
256 #define COMPILER_VARIANT "client"
257 #endif
258
259
260 void os::Bsd::initialize_system_info() {
261 int mib[2];
262 size_t len;
263 int cpu_val;
264 u_long mem_val;
265
266 /* get processors count via hw.ncpus sysctl */
267 mib[0] = CTL_HW;
268 mib[1] = HW_NCPU;
269 len = sizeof(cpu_val);
270 if (sysctl(mib, 2, &cpu_val, &len, NULL, 0) != -1 && cpu_val >= 1) {
271 set_processor_count(cpu_val);
272 }
273 else {
274 set_processor_count(1); // fallback
275 }
276
277 /* get physical memory via hw.usermem sysctl (hw.usermem is used
278 * instead of hw.physmem because we need size of allocatable memory
279 */
280 mib[0] = CTL_HW;
281 mib[1] = HW_USERMEM;
282 len = sizeof(mem_val);
283 if (sysctl(mib, 2, &mem_val, &len, NULL, 0) != -1)
284 _physical_memory = mem_val;
285 else
286 _physical_memory = 256*1024*1024; // fallback (XXXBSD?)
287
288 #ifdef __OpenBSD__
289 {
290 // limit _physical_memory memory view on OpenBSD since
291 // datasize rlimit restricts us anyway.
292 struct rlimit limits;
293 getrlimit(RLIMIT_DATA, &limits);
294 _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur);
295 }
296 #endif
297 }
298
299 #ifdef __APPLE__
300 static const char *get_home() {
301 const char *home_dir = ::getenv("HOME");
302 if ((home_dir == NULL) || (*home_dir == '\0')) {
303 struct passwd *passwd_info = getpwuid(geteuid());
304 if (passwd_info != NULL) {
305 home_dir = passwd_info->pw_dir;
306 }
307 }
308
309 return home_dir;
310 }
311 #endif
312
313 void os::init_system_properties_values() {
314 // char arch[12];
315 // sysinfo(SI_ARCHITECTURE, arch, sizeof(arch));
316
317 // The next steps are taken in the product version:
318 //
319 // Obtain the JAVA_HOME value from the location of libjvm[_g].so.
320 // This library should be located at:
321 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm[_g].so.
322 //
323 // If "/jre/lib/" appears at the right place in the path, then we
324 // assume libjvm[_g].so is installed in a JDK and we use this path.
325 //
326 // Otherwise exit with message: "Could not create the Java virtual machine."
327 //
328 // The following extra steps are taken in the debugging version:
329 //
330 // If "/jre/lib/" does NOT appear at the right place in the path
331 // instead of exit check for $JAVA_HOME environment variable.
332 //
333 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>,
334 // then we append a fake suffix "hotspot/libjvm[_g].so" to this path so
335 // it looks like libjvm[_g].so is installed there
336 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm[_g].so.
337 //
338 // Otherwise exit.
339 //
340 // Important note: if the location of libjvm.so changes this
341 // code needs to be changed accordingly.
342
343 // The next few definitions allow the code to be verbatim:
344 #define malloc(n) (char*)NEW_C_HEAP_ARRAY(char, (n), mtInternal)
345 #define getenv(n) ::getenv(n)
346
347 /*
348 * See ld(1):
349 * The linker uses the following search paths to locate required
350 * shared libraries:
351 * 1: ...
352 * ...
353 * 7: The default directories, normally /lib and /usr/lib.
354 */
355 #ifndef DEFAULT_LIBPATH
356 #define DEFAULT_LIBPATH "/lib:/usr/lib"
357 #endif
358
359 #define EXTENSIONS_DIR "/lib/ext"
360 #define ENDORSED_DIR "/lib/endorsed"
361 #define REG_DIR "/usr/java/packages"
362
363 #ifdef __APPLE__
364 #define SYS_EXTENSIONS_DIR "/Library/Java/Extensions"
365 #define SYS_EXTENSIONS_DIRS SYS_EXTENSIONS_DIR ":/Network" SYS_EXTENSIONS_DIR ":/System" SYS_EXTENSIONS_DIR ":/usr/lib/java"
366 const char *user_home_dir = get_home();
367 // the null in SYS_EXTENSIONS_DIRS counts for the size of the colon after user_home_dir
368 int system_ext_size = strlen(user_home_dir) + sizeof(SYS_EXTENSIONS_DIR) +
369 sizeof(SYS_EXTENSIONS_DIRS);
370 #endif
371
372 {
373 /* sysclasspath, java_home, dll_dir */
374 {
375 char *home_path;
376 char *dll_path;
377 char *pslash;
378 char buf[MAXPATHLEN];
379 os::jvm_path(buf, sizeof(buf));
380
381 // Found the full path to libjvm.so.
382 // Now cut the path to <java_home>/jre if we can.
383 *(strrchr(buf, '/')) = '\0'; /* get rid of /libjvm.so */
384 pslash = strrchr(buf, '/');
385 if (pslash != NULL)
386 *pslash = '\0'; /* get rid of /{client|server|hotspot} */
387 dll_path = malloc(strlen(buf) + 1);
388 if (dll_path == NULL)
389 return;
390 strcpy(dll_path, buf);
391 Arguments::set_dll_dir(dll_path);
392
393 if (pslash != NULL) {
394 pslash = strrchr(buf, '/');
395 if (pslash != NULL) {
396 *pslash = '\0'; /* get rid of /<arch> (/lib on macosx) */
397 #ifndef __APPLE__
398 pslash = strrchr(buf, '/');
399 if (pslash != NULL)
400 *pslash = '\0'; /* get rid of /lib */
401 #endif
402 }
403 }
404
405 home_path = malloc(strlen(buf) + 1);
406 if (home_path == NULL)
407 return;
408 strcpy(home_path, buf);
409 Arguments::set_java_home(home_path);
410
411 if (!set_boot_path('/', ':'))
412 return;
413 }
414
415 /*
416 * Where to look for native libraries
417 *
418 * Note: Due to a legacy implementation, most of the library path
419 * is set in the launcher. This was to accomodate linking restrictions
420 * on legacy Bsd implementations (which are no longer supported).
421 * Eventually, all the library path setting will be done here.
422 *
423 * However, to prevent the proliferation of improperly built native
424 * libraries, the new path component /usr/java/packages is added here.
425 * Eventually, all the library path setting will be done here.
426 */
427 {
428 char *ld_library_path;
429
430 /*
431 * Construct the invariant part of ld_library_path. Note that the
432 * space for the colon and the trailing null are provided by the
433 * nulls included by the sizeof operator (so actually we allocate
434 * a byte more than necessary).
435 */
436 #ifdef __APPLE__
437 ld_library_path = (char *) malloc(system_ext_size);
438 sprintf(ld_library_path, "%s" SYS_EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS, user_home_dir);
439 #else
440 ld_library_path = (char *) malloc(sizeof(REG_DIR) + sizeof("/lib/") +
441 strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH));
442 sprintf(ld_library_path, REG_DIR "/lib/%s:" DEFAULT_LIBPATH, cpu_arch);
443 #endif
444
445 /*
446 * Get the user setting of LD_LIBRARY_PATH, and prepended it. It
447 * should always exist (until the legacy problem cited above is
448 * addressed).
449 */
450 #ifdef __APPLE__
451 // Prepend the default path with the JAVA_LIBRARY_PATH so that the app launcher code can specify a directory inside an app wrapper
452 char *l = getenv("JAVA_LIBRARY_PATH");
453 if (l != NULL) {
454 char *t = ld_library_path;
455 /* That's +1 for the colon and +1 for the trailing '\0' */
456 ld_library_path = (char *) malloc(strlen(l) + 1 + strlen(t) + 1);
457 sprintf(ld_library_path, "%s:%s", l, t);
458 free(t);
459 }
460
461 char *v = getenv("DYLD_LIBRARY_PATH");
462 #else
463 char *v = getenv("LD_LIBRARY_PATH");
464 #endif
465 if (v != NULL) {
466 char *t = ld_library_path;
467 /* That's +1 for the colon and +1 for the trailing '\0' */
468 ld_library_path = (char *) malloc(strlen(v) + 1 + strlen(t) + 1);
469 sprintf(ld_library_path, "%s:%s", v, t);
470 free(t);
471 }
472
473 #ifdef __APPLE__
474 // Apple's Java6 has "." at the beginning of java.library.path.
475 // OpenJDK on Windows has "." at the end of java.library.path.
476 // OpenJDK on Linux and Solaris don't have "." in java.library.path
477 // at all. To ease the transition from Apple's Java6 to OpenJDK7,
478 // "." is appended to the end of java.library.path. Yes, this
479 // could cause a change in behavior, but Apple's Java6 behavior
480 // can be achieved by putting "." at the beginning of the
481 // JAVA_LIBRARY_PATH environment variable.
482 {
483 char *t = ld_library_path;
484 // that's +3 for appending ":." and the trailing '\0'
485 ld_library_path = (char *) malloc(strlen(t) + 3);
486 sprintf(ld_library_path, "%s:%s", t, ".");
487 free(t);
488 }
489 #endif
490
491 Arguments::set_library_path(ld_library_path);
492 }
493
494 /*
495 * Extensions directories.
496 *
497 * Note that the space for the colon and the trailing null are provided
498 * by the nulls included by the sizeof operator (so actually one byte more
499 * than necessary is allocated).
500 */
501 {
502 #ifdef __APPLE__
503 char *buf = malloc(strlen(Arguments::get_java_home()) +
504 sizeof(EXTENSIONS_DIR) + system_ext_size);
505 sprintf(buf, "%s" SYS_EXTENSIONS_DIR ":%s" EXTENSIONS_DIR ":"
506 SYS_EXTENSIONS_DIRS, user_home_dir, Arguments::get_java_home());
507 #else
508 char *buf = malloc(strlen(Arguments::get_java_home()) +
509 sizeof(EXTENSIONS_DIR) + sizeof(REG_DIR) + sizeof(EXTENSIONS_DIR));
510 sprintf(buf, "%s" EXTENSIONS_DIR ":" REG_DIR EXTENSIONS_DIR,
511 Arguments::get_java_home());
512 #endif
513
514 Arguments::set_ext_dirs(buf);
515 }
516
517 /* Endorsed standards default directory. */
518 {
519 char * buf;
520 buf = malloc(strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR));
521 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home());
522 Arguments::set_endorsed_dirs(buf);
523 }
524 }
525
526 #ifdef __APPLE__
527 #undef SYS_EXTENSIONS_DIR
528 #endif
529 #undef malloc
530 #undef getenv
531 #undef EXTENSIONS_DIR
532 #undef ENDORSED_DIR
533
534 // Done
535 return;
536 }
537
538 ////////////////////////////////////////////////////////////////////////////////
539 // breakpoint support
540
541 void os::breakpoint() {
542 BREAKPOINT;
543 }
544
545 extern "C" void breakpoint() {
546 // use debugger to set breakpoint here
547 }
548
549 ////////////////////////////////////////////////////////////////////////////////
550 // signal support
551
552 debug_only(static bool signal_sets_initialized = false);
553 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs;
554
555 bool os::Bsd::is_sig_ignored(int sig) {
556 struct sigaction oact;
557 sigaction(sig, (struct sigaction*)NULL, &oact);
558 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction)
559 : CAST_FROM_FN_PTR(void*, oact.sa_handler);
560 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN))
561 return true;
562 else
563 return false;
564 }
565
566 void os::Bsd::signal_sets_init() {
567 // Should also have an assertion stating we are still single-threaded.
568 assert(!signal_sets_initialized, "Already initialized");
569 // Fill in signals that are necessarily unblocked for all threads in
570 // the VM. Currently, we unblock the following signals:
571 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
572 // by -Xrs (=ReduceSignalUsage));
573 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
574 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
575 // the dispositions or masks wrt these signals.
576 // Programs embedding the VM that want to use the above signals for their
577 // own purposes must, at this time, use the "-Xrs" option to prevent
578 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
579 // (See bug 4345157, and other related bugs).
580 // In reality, though, unblocking these signals is really a nop, since
581 // these signals are not blocked by default.
582 sigemptyset(&unblocked_sigs);
583 sigemptyset(&allowdebug_blocked_sigs);
584 sigaddset(&unblocked_sigs, SIGILL);
585 sigaddset(&unblocked_sigs, SIGSEGV);
586 sigaddset(&unblocked_sigs, SIGBUS);
587 sigaddset(&unblocked_sigs, SIGFPE);
588 sigaddset(&unblocked_sigs, SR_signum);
589
590 if (!ReduceSignalUsage) {
591 if (!os::Bsd::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
592 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
593 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL);
594 }
595 if (!os::Bsd::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
596 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
597 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL);
598 }
599 if (!os::Bsd::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
600 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
601 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL);
602 }
603 }
604 // Fill in signals that are blocked by all but the VM thread.
605 sigemptyset(&vm_sigs);
606 if (!ReduceSignalUsage)
607 sigaddset(&vm_sigs, BREAK_SIGNAL);
608 debug_only(signal_sets_initialized = true);
609
610 }
611
612 // These are signals that are unblocked while a thread is running Java.
613 // (For some reason, they get blocked by default.)
614 sigset_t* os::Bsd::unblocked_signals() {
615 assert(signal_sets_initialized, "Not initialized");
616 return &unblocked_sigs;
617 }
618
619 // These are the signals that are blocked while a (non-VM) thread is
620 // running Java. Only the VM thread handles these signals.
621 sigset_t* os::Bsd::vm_signals() {
622 assert(signal_sets_initialized, "Not initialized");
623 return &vm_sigs;
624 }
625
626 // These are signals that are blocked during cond_wait to allow debugger in
627 sigset_t* os::Bsd::allowdebug_blocked_signals() {
628 assert(signal_sets_initialized, "Not initialized");
629 return &allowdebug_blocked_sigs;
630 }
631
632 void os::Bsd::hotspot_sigmask(Thread* thread) {
633
634 //Save caller's signal mask before setting VM signal mask
635 sigset_t caller_sigmask;
636 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask);
637
638 OSThread* osthread = thread->osthread();
639 osthread->set_caller_sigmask(caller_sigmask);
640
641 pthread_sigmask(SIG_UNBLOCK, os::Bsd::unblocked_signals(), NULL);
642
643 if (!ReduceSignalUsage) {
644 if (thread->is_VM_thread()) {
645 // Only the VM thread handles BREAK_SIGNAL ...
646 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
647 } else {
648 // ... all other threads block BREAK_SIGNAL
649 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
650 }
651 }
652 }
653
654
655 //////////////////////////////////////////////////////////////////////////////
656 // create new thread
657
658 static address highest_vm_reserved_address();
659
660 // check if it's safe to start a new thread
661 static bool _thread_safety_check(Thread* thread) {
662 return true;
663 }
664
665 #ifdef __APPLE__
666 // library handle for calling objc_registerThreadWithCollector()
667 // without static linking to the libobjc library
668 #define OBJC_LIB "/usr/lib/libobjc.dylib"
669 #define OBJC_GCREGISTER "objc_registerThreadWithCollector"
670 typedef void (*objc_registerThreadWithCollector_t)();
671 extern "C" objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction;
672 objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction = NULL;
673 #endif
674
675 // Thread start routine for all newly created threads
676 static void *java_start(Thread *thread) {
677 // Try to randomize the cache line index of hot stack frames.
678 // This helps when threads of the same stack traces evict each other's
679 // cache lines. The threads can be either from the same JVM instance, or
680 // from different JVM instances. The benefit is especially true for
681 // processors with hyperthreading technology.
682 static int counter = 0;
683 int pid = os::current_process_id();
684 alloca(((pid ^ counter++) & 7) * 128);
685
686 ThreadLocalStorage::set_thread(thread);
687
688 OSThread* osthread = thread->osthread();
689 Monitor* sync = osthread->startThread_lock();
690
691 // non floating stack BsdThreads needs extra check, see above
692 if (!_thread_safety_check(thread)) {
693 // notify parent thread
694 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag);
695 osthread->set_state(ZOMBIE);
696 sync->notify_all();
697 return NULL;
698 }
699
700 #ifdef __APPLE__
701 // thread_id is mach thread on macos
702 osthread->set_thread_id(::mach_thread_self());
703 #else
704 // thread_id is pthread_id on BSD
705 osthread->set_thread_id(::pthread_self());
706 #endif
707 // initialize signal mask for this thread
708 os::Bsd::hotspot_sigmask(thread);
709
710 // initialize floating point control register
711 os::Bsd::init_thread_fpu_state();
712
713 #ifdef __APPLE__
714 // register thread with objc gc
715 if (objc_registerThreadWithCollectorFunction != NULL) {
716 objc_registerThreadWithCollectorFunction();
717 }
718 #endif
719
720 // handshaking with parent thread
721 {
722 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag);
723
724 // notify parent thread
725 osthread->set_state(INITIALIZED);
726 sync->notify_all();
727
728 // wait until os::start_thread()
729 while (osthread->get_state() == INITIALIZED) {
730 sync->wait(Mutex::_no_safepoint_check_flag);
731 }
732 }
733
734 // call one more level start routine
735 thread->run();
736
737 return 0;
738 }
739
740 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
741 assert(thread->osthread() == NULL, "caller responsible");
742
743 // Allocate the OSThread object
744 OSThread* osthread = new OSThread(NULL, NULL);
745 if (osthread == NULL) {
746 return false;
747 }
748
749 // set the correct thread state
750 osthread->set_thread_type(thr_type);
751
752 // Initial state is ALLOCATED but not INITIALIZED
753 osthread->set_state(ALLOCATED);
754
755 thread->set_osthread(osthread);
756
757 // init thread attributes
758 pthread_attr_t attr;
759 pthread_attr_init(&attr);
760 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
761
762 // stack size
763 if (os::Bsd::supports_variable_stack_size()) {
764 // calculate stack size if it's not specified by caller
765 if (stack_size == 0) {
766 stack_size = os::Bsd::default_stack_size(thr_type);
767
768 switch (thr_type) {
769 case os::java_thread:
770 // Java threads use ThreadStackSize which default value can be
771 // changed with the flag -Xss
772 assert (JavaThread::stack_size_at_create() > 0, "this should be set");
773 stack_size = JavaThread::stack_size_at_create();
774 break;
775 case os::compiler_thread:
776 if (CompilerThreadStackSize > 0) {
777 stack_size = (size_t)(CompilerThreadStackSize * K);
778 break;
779 } // else fall through:
780 // use VMThreadStackSize if CompilerThreadStackSize is not defined
781 case os::vm_thread:
782 case os::pgc_thread:
783 case os::cgc_thread:
784 case os::watcher_thread:
785 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
786 break;
787 }
788 }
789
790 stack_size = MAX2(stack_size, os::Bsd::min_stack_allowed);
791 pthread_attr_setstacksize(&attr, stack_size);
792 } else {
793 // let pthread_create() pick the default value.
794 }
795
796 ThreadState state;
797
798 {
799 pthread_t tid;
800 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) java_start, thread);
801
802 pthread_attr_destroy(&attr);
803
804 if (ret != 0) {
805 if (PrintMiscellaneous && (Verbose || WizardMode)) {
806 perror("pthread_create()");
807 }
808 // Need to clean up stuff we've allocated so far
809 thread->set_osthread(NULL);
810 delete osthread;
811 return false;
812 }
813
814 // Store pthread info into the OSThread
815 osthread->set_pthread_id(tid);
816
817 // Wait until child thread is either initialized or aborted
818 {
819 Monitor* sync_with_child = osthread->startThread_lock();
820 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag);
821 while ((state = osthread->get_state()) == ALLOCATED) {
822 sync_with_child->wait(Mutex::_no_safepoint_check_flag);
823 }
824 }
825
826 }
827
828 // Aborted due to thread limit being reached
829 if (state == ZOMBIE) {
830 thread->set_osthread(NULL);
831 delete osthread;
832 return false;
833 }
834
835 // The thread is returned suspended (in state INITIALIZED),
836 // and is started higher up in the call chain
837 assert(state == INITIALIZED, "race condition");
838 return true;
839 }
840
841 /////////////////////////////////////////////////////////////////////////////
842 // attach existing thread
843
844 // bootstrap the main thread
845 bool os::create_main_thread(JavaThread* thread) {
846 assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread");
847 return create_attached_thread(thread);
848 }
849
850 bool os::create_attached_thread(JavaThread* thread) {
851 #ifdef ASSERT
852 thread->verify_not_published();
853 #endif
854
855 // Allocate the OSThread object
856 OSThread* osthread = new OSThread(NULL, NULL);
857
858 if (osthread == NULL) {
859 return false;
860 }
861
862 // Store pthread info into the OSThread
863 #ifdef __APPLE__
864 osthread->set_thread_id(::mach_thread_self());
865 #else
866 osthread->set_thread_id(::pthread_self());
867 #endif
868 osthread->set_pthread_id(::pthread_self());
869
870 // initialize floating point control register
871 os::Bsd::init_thread_fpu_state();
872
873 // Initial thread state is RUNNABLE
874 osthread->set_state(RUNNABLE);
875
876 thread->set_osthread(osthread);
877
878 // initialize signal mask for this thread
879 // and save the caller's signal mask
880 os::Bsd::hotspot_sigmask(thread);
881
882 return true;
883 }
884
885 void os::pd_start_thread(Thread* thread) {
886 OSThread * osthread = thread->osthread();
887 assert(osthread->get_state() != INITIALIZED, "just checking");
888 Monitor* sync_with_child = osthread->startThread_lock();
889 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag);
890 sync_with_child->notify();
891 }
892
893 // Free Bsd resources related to the OSThread
894 void os::free_thread(OSThread* osthread) {
895 assert(osthread != NULL, "osthread not set");
896
897 if (Thread::current()->osthread() == osthread) {
898 // Restore caller's signal mask
899 sigset_t sigmask = osthread->caller_sigmask();
900 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
901 }
902
903 delete osthread;
904 }
905
906 //////////////////////////////////////////////////////////////////////////////
907 // thread local storage
908
909 int os::allocate_thread_local_storage() {
910 pthread_key_t key;
911 int rslt = pthread_key_create(&key, NULL);
912 assert(rslt == 0, "cannot allocate thread local storage");
913 return (int)key;
914 }
915
916 // Note: This is currently not used by VM, as we don't destroy TLS key
917 // on VM exit.
918 void os::free_thread_local_storage(int index) {
919 int rslt = pthread_key_delete((pthread_key_t)index);
920 assert(rslt == 0, "invalid index");
921 }
922
923 void os::thread_local_storage_at_put(int index, void* value) {
924 int rslt = pthread_setspecific((pthread_key_t)index, value);
925 assert(rslt == 0, "pthread_setspecific failed");
926 }
927
928 extern "C" Thread* get_thread() {
929 return ThreadLocalStorage::thread();
930 }
931
932
933 ////////////////////////////////////////////////////////////////////////////////
934 // time support
935
936 // Time since start-up in seconds to a fine granularity.
937 // Used by VMSelfDestructTimer and the MemProfiler.
938 double os::elapsedTime() {
939
940 return (double)(os::elapsed_counter()) * 0.000001;
941 }
942
943 jlong os::elapsed_counter() {
944 timeval time;
945 int status = gettimeofday(&time, NULL);
946 return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count;
947 }
948
949 jlong os::elapsed_frequency() {
950 return (1000 * 1000);
951 }
952
953 // XXX: For now, code this as if BSD does not support vtime.
954 bool os::supports_vtime() { return false; }
955 bool os::enable_vtime() { return false; }
956 bool os::vtime_enabled() { return false; }
957 double os::elapsedVTime() {
958 // better than nothing, but not much
959 return elapsedTime();
960 }
961
962 jlong os::javaTimeMillis() {
963 timeval time;
964 int status = gettimeofday(&time, NULL);
965 assert(status != -1, "bsd error");
966 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000);
967 }
968
969 #ifndef CLOCK_MONOTONIC
970 #define CLOCK_MONOTONIC (1)
971 #endif
972
973 #ifdef __APPLE__
974 void os::Bsd::clock_init() {
975 // XXXDARWIN: Investigate replacement monotonic clock
976 }
977 #else
978 void os::Bsd::clock_init() {
979 struct timespec res;
980 struct timespec tp;
981 if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 &&
982 ::clock_gettime(CLOCK_MONOTONIC, &tp) == 0) {
983 // yes, monotonic clock is supported
984 _clock_gettime = ::clock_gettime;
985 }
986 }
987 #endif
988
989
990 jlong os::javaTimeNanos() {
991 if (Bsd::supports_monotonic_clock()) {
992 struct timespec tp;
993 int status = Bsd::clock_gettime(CLOCK_MONOTONIC, &tp);
994 assert(status == 0, "gettime error");
995 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec);
996 return result;
997 } else {
998 timeval time;
999 int status = gettimeofday(&time, NULL);
1000 assert(status != -1, "bsd error");
1001 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec);
1002 return 1000 * usecs;
1003 }
1004 }
1005
1006 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1007 if (Bsd::supports_monotonic_clock()) {
1008 info_ptr->max_value = ALL_64_BITS;
1009
1010 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past
1011 info_ptr->may_skip_backward = false; // not subject to resetting or drifting
1012 info_ptr->may_skip_forward = false; // not subject to resetting or drifting
1013 } else {
1014 // gettimeofday - based on time in seconds since the Epoch thus does not wrap
1015 info_ptr->max_value = ALL_64_BITS;
1016
1017 // gettimeofday is a real time clock so it skips
1018 info_ptr->may_skip_backward = true;
1019 info_ptr->may_skip_forward = true;
1020 }
1021
1022 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1023 }
1024
1025 // Return the real, user, and system times in seconds from an
1026 // arbitrary fixed point in the past.
1027 bool os::getTimesSecs(double* process_real_time,
1028 double* process_user_time,
1029 double* process_system_time) {
1030 struct tms ticks;
1031 clock_t real_ticks = times(&ticks);
1032
1033 if (real_ticks == (clock_t) (-1)) {
1034 return false;
1035 } else {
1036 double ticks_per_second = (double) clock_tics_per_sec;
1037 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1038 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1039 *process_real_time = ((double) real_ticks) / ticks_per_second;
1040
1041 return true;
1042 }
1043 }
1044
1045
1046 char * os::local_time_string(char *buf, size_t buflen) {
1047 struct tm t;
1048 time_t long_time;
1049 time(&long_time);
1050 localtime_r(&long_time, &t);
1051 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1052 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1053 t.tm_hour, t.tm_min, t.tm_sec);
1054 return buf;
1055 }
1056
1057 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
1058 return localtime_r(clock, res);
1059 }
1060
1061 ////////////////////////////////////////////////////////////////////////////////
1062 // runtime exit support
1063
1064 // Note: os::shutdown() might be called very early during initialization, or
1065 // called from signal handler. Before adding something to os::shutdown(), make
1066 // sure it is async-safe and can handle partially initialized VM.
1067 void os::shutdown() {
1068
1069 // allow PerfMemory to attempt cleanup of any persistent resources
1070 perfMemory_exit();
1071
1072 // needs to remove object in file system
1073 AttachListener::abort();
1074
1075 // flush buffered output, finish log files
1076 ostream_abort();
1077
1078 // Check for abort hook
1079 abort_hook_t abort_hook = Arguments::abort_hook();
1080 if (abort_hook != NULL) {
1081 abort_hook();
1082 }
1083
1084 }
1085
1086 // Note: os::abort() might be called very early during initialization, or
1087 // called from signal handler. Before adding something to os::abort(), make
1088 // sure it is async-safe and can handle partially initialized VM.
1089 void os::abort(bool dump_core) {
1090 os::shutdown();
1091 if (dump_core) {
1092 #ifndef PRODUCT
1093 fdStream out(defaultStream::output_fd());
1094 out.print_raw("Current thread is ");
1095 char buf[16];
1096 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1097 out.print_raw_cr(buf);
1098 out.print_raw_cr("Dumping core ...");
1099 #endif
1100 ::abort(); // dump core
1101 }
1102
1103 ::exit(1);
1104 }
1105
1106 // Die immediately, no exit hook, no abort hook, no cleanup.
1107 void os::die() {
1108 // _exit() on BsdThreads only kills current thread
1109 ::abort();
1110 }
1111
1112 // unused on bsd for now.
1113 void os::set_error_file(const char *logfile) {}
1114
1115
1116 // This method is a copy of JDK's sysGetLastErrorString
1117 // from src/solaris/hpi/src/system_md.c
1118
1119 size_t os::lasterror(char *buf, size_t len) {
1120
1121 if (errno == 0) return 0;
1122
1123 const char *s = ::strerror(errno);
1124 size_t n = ::strlen(s);
1125 if (n >= len) {
1126 n = len - 1;
1127 }
1128 ::strncpy(buf, s, n);
1129 buf[n] = '\0';
1130 return n;
1131 }
1132
1133 intx os::current_thread_id() {
1134 #ifdef __APPLE__
1135 return (intx)::mach_thread_self();
1136 #else
1137 return (intx)::pthread_self();
1138 #endif
1139 }
1140 int os::current_process_id() {
1141
1142 // Under the old bsd thread library, bsd gives each thread
1143 // its own process id. Because of this each thread will return
1144 // a different pid if this method were to return the result
1145 // of getpid(2). Bsd provides no api that returns the pid
1146 // of the launcher thread for the vm. This implementation
1147 // returns a unique pid, the pid of the launcher thread
1148 // that starts the vm 'process'.
1149
1150 // Under the NPTL, getpid() returns the same pid as the
1151 // launcher thread rather than a unique pid per thread.
1152 // Use gettid() if you want the old pre NPTL behaviour.
1153
1154 // if you are looking for the result of a call to getpid() that
1155 // returns a unique pid for the calling thread, then look at the
1156 // OSThread::thread_id() method in osThread_bsd.hpp file
1157
1158 return (int)(_initial_pid ? _initial_pid : getpid());
1159 }
1160
1161 // DLL functions
1162
1163 #define JNI_LIB_PREFIX "lib"
1164 #ifdef __APPLE__
1165 #define JNI_LIB_SUFFIX ".dylib"
1166 #else
1167 #define JNI_LIB_SUFFIX ".so"
1168 #endif
1169
1170 const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; }
1171
1172 // This must be hard coded because it's the system's temporary
1173 // directory not the java application's temp directory, ala java.io.tmpdir.
1174 #ifdef __APPLE__
1175 // macosx has a secure per-user temporary directory
1176 char temp_path_storage[PATH_MAX];
1177 const char* os::get_temp_directory() {
1178 static char *temp_path = NULL;
1179 if (temp_path == NULL) {
1180 int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX);
1181 if (pathSize == 0 || pathSize > PATH_MAX) {
1182 strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage));
1183 }
1184 temp_path = temp_path_storage;
1185 }
1186 return temp_path;
1187 }
1188 #else /* __APPLE__ */
1189 const char* os::get_temp_directory() { return "/tmp"; }
1190 #endif /* __APPLE__ */
1191
1192 static bool file_exists(const char* filename) {
1193 struct stat statbuf;
1194 if (filename == NULL || strlen(filename) == 0) {
1195 return false;
1196 }
1197 return os::stat(filename, &statbuf) == 0;
1198 }
1199
1200 void os::dll_build_name(char* buffer, size_t buflen,
1201 const char* pname, const char* fname) {
1202 // Copied from libhpi
1203 const size_t pnamelen = pname ? strlen(pname) : 0;
1204
1205 // Quietly truncate on buffer overflow. Should be an error.
1206 if (pnamelen + strlen(fname) + strlen(JNI_LIB_PREFIX) + strlen(JNI_LIB_SUFFIX) + 2 > buflen) {
1207 *buffer = '\0';
1208 return;
1209 }
1210
1211 if (pnamelen == 0) {
1212 snprintf(buffer, buflen, JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, fname);
1213 } else if (strchr(pname, *os::path_separator()) != NULL) {
1214 int n;
1215 char** pelements = split_path(pname, &n);
1216 for (int i = 0 ; i < n ; i++) {
1217 // Really shouldn't be NULL, but check can't hurt
1218 if (pelements[i] == NULL || strlen(pelements[i]) == 0) {
1219 continue; // skip the empty path values
1220 }
1221 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX,
1222 pelements[i], fname);
1223 if (file_exists(buffer)) {
1224 break;
1225 }
1226 }
1227 // release the storage
1228 for (int i = 0 ; i < n ; i++) {
1229 if (pelements[i] != NULL) {
1230 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal);
1231 }
1232 }
1233 if (pelements != NULL) {
1234 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal);
1235 }
1236 } else {
1237 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, pname, fname);
1238 }
1239 }
1240
1241 const char* os::get_current_directory(char *buf, int buflen) {
1242 return getcwd(buf, buflen);
1243 }
1244
1245 // check if addr is inside libjvm[_g].so
1246 bool os::address_is_in_vm(address addr) {
1247 static address libjvm_base_addr;
1248 Dl_info dlinfo;
1249
1250 if (libjvm_base_addr == NULL) {
1251 dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo);
1252 libjvm_base_addr = (address)dlinfo.dli_fbase;
1253 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm");
1254 }
1255
1256 if (dladdr((void *)addr, &dlinfo)) {
1257 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true;
1258 }
1259
1260 return false;
1261 }
1262
1263
1264 #define MACH_MAXSYMLEN 256
1265
1266 bool os::dll_address_to_function_name(address addr, char *buf,
1267 int buflen, int *offset) {
1268 Dl_info dlinfo;
1269 char localbuf[MACH_MAXSYMLEN];
1270
1271 // dladdr will find names of dynamic functions only, but does
1272 // it set dli_fbase with mach_header address when it "fails" ?
1273 if (dladdr((void*)addr, &dlinfo) && dlinfo.dli_sname != NULL) {
1274 if (buf != NULL) {
1275 if(!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) {
1276 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname);
1277 }
1278 }
1279 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1280 return true;
1281 } else if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != 0) {
1282 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1283 buf, buflen, offset, dlinfo.dli_fname)) {
1284 return true;
1285 }
1286 }
1287
1288 // Handle non-dymanic manually:
1289 if (dlinfo.dli_fbase != NULL &&
1290 Decoder::decode(addr, localbuf, MACH_MAXSYMLEN, offset, dlinfo.dli_fbase)) {
1291 if(!Decoder::demangle(localbuf, buf, buflen)) {
1292 jio_snprintf(buf, buflen, "%s", localbuf);
1293 }
1294 return true;
1295 }
1296 if (buf != NULL) buf[0] = '\0';
1297 if (offset != NULL) *offset = -1;
1298 return false;
1299 }
1300
1301 // ported from solaris version
1302 bool os::dll_address_to_library_name(address addr, char* buf,
1303 int buflen, int* offset) {
1304 Dl_info dlinfo;
1305
1306 if (dladdr((void*)addr, &dlinfo)){
1307 if (buf) jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname);
1308 if (offset) *offset = addr - (address)dlinfo.dli_fbase;
1309 return true;
1310 } else {
1311 if (buf) buf[0] = '\0';
1312 if (offset) *offset = -1;
1313 return false;
1314 }
1315 }
1316
1317 // Loads .dll/.so and
1318 // in case of error it checks if .dll/.so was built for the
1319 // same architecture as Hotspot is running on
1320
1321 #ifdef __APPLE__
1322 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1323 void * result= ::dlopen(filename, RTLD_LAZY);
1324 if (result != NULL) {
1325 // Successful loading
1326 return result;
1327 }
1328
1329 // Read system error message into ebuf
1330 ::strncpy(ebuf, ::dlerror(), ebuflen-1);
1331 ebuf[ebuflen-1]='\0';
1332
1333 return NULL;
1334 }
1335 #else
1336 void * os::dll_load(const char *filename, char *ebuf, int ebuflen)
1337 {
1338 void * result= ::dlopen(filename, RTLD_LAZY);
1339 if (result != NULL) {
1340 // Successful loading
1341 return result;
1342 }
1343
1344 Elf32_Ehdr elf_head;
1345
1346 // Read system error message into ebuf
1347 // It may or may not be overwritten below
1348 ::strncpy(ebuf, ::dlerror(), ebuflen-1);
1349 ebuf[ebuflen-1]='\0';
1350 int diag_msg_max_length=ebuflen-strlen(ebuf);
1351 char* diag_msg_buf=ebuf+strlen(ebuf);
1352
1353 if (diag_msg_max_length==0) {
1354 // No more space in ebuf for additional diagnostics message
1355 return NULL;
1356 }
1357
1358
1359 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK);
1360
1361 if (file_descriptor < 0) {
1362 // Can't open library, report dlerror() message
1363 return NULL;
1364 }
1365
1366 bool failed_to_read_elf_head=
1367 (sizeof(elf_head)!=
1368 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ;
1369
1370 ::close(file_descriptor);
1371 if (failed_to_read_elf_head) {
1372 // file i/o error - report dlerror() msg
1373 return NULL;
1374 }
1375
1376 typedef struct {
1377 Elf32_Half code; // Actual value as defined in elf.h
1378 Elf32_Half compat_class; // Compatibility of archs at VM's sense
1379 char elf_class; // 32 or 64 bit
1380 char endianess; // MSB or LSB
1381 char* name; // String representation
1382 } arch_t;
1383
1384 #ifndef EM_486
1385 #define EM_486 6 /* Intel 80486 */
1386 #endif
1387
1388 #ifndef EM_MIPS_RS3_LE
1389 #define EM_MIPS_RS3_LE 10 /* MIPS */
1390 #endif
1391
1392 #ifndef EM_PPC64
1393 #define EM_PPC64 21 /* PowerPC64 */
1394 #endif
1395
1396 #ifndef EM_S390
1397 #define EM_S390 22 /* IBM System/390 */
1398 #endif
1399
1400 #ifndef EM_IA_64
1401 #define EM_IA_64 50 /* HP/Intel IA-64 */
1402 #endif
1403
1404 #ifndef EM_X86_64
1405 #define EM_X86_64 62 /* AMD x86-64 */
1406 #endif
1407
1408 static const arch_t arch_array[]={
1409 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1410 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1411 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"},
1412 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"},
1413 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1414 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1415 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"},
1416 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"},
1417 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"},
1418 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"},
1419 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"},
1420 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"},
1421 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"},
1422 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"},
1423 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"},
1424 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"}
1425 };
1426
1427 #if (defined IA32)
1428 static Elf32_Half running_arch_code=EM_386;
1429 #elif (defined AMD64)
1430 static Elf32_Half running_arch_code=EM_X86_64;
1431 #elif (defined IA64)
1432 static Elf32_Half running_arch_code=EM_IA_64;
1433 #elif (defined __sparc) && (defined _LP64)
1434 static Elf32_Half running_arch_code=EM_SPARCV9;
1435 #elif (defined __sparc) && (!defined _LP64)
1436 static Elf32_Half running_arch_code=EM_SPARC;
1437 #elif (defined __powerpc64__)
1438 static Elf32_Half running_arch_code=EM_PPC64;
1439 #elif (defined __powerpc__)
1440 static Elf32_Half running_arch_code=EM_PPC;
1441 #elif (defined ARM)
1442 static Elf32_Half running_arch_code=EM_ARM;
1443 #elif (defined S390)
1444 static Elf32_Half running_arch_code=EM_S390;
1445 #elif (defined ALPHA)
1446 static Elf32_Half running_arch_code=EM_ALPHA;
1447 #elif (defined MIPSEL)
1448 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE;
1449 #elif (defined PARISC)
1450 static Elf32_Half running_arch_code=EM_PARISC;
1451 #elif (defined MIPS)
1452 static Elf32_Half running_arch_code=EM_MIPS;
1453 #elif (defined M68K)
1454 static Elf32_Half running_arch_code=EM_68K;
1455 #else
1456 #error Method os::dll_load requires that one of following is defined:\
1457 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K
1458 #endif
1459
1460 // Identify compatability class for VM's architecture and library's architecture
1461 // Obtain string descriptions for architectures
1462
1463 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL};
1464 int running_arch_index=-1;
1465
1466 for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) {
1467 if (running_arch_code == arch_array[i].code) {
1468 running_arch_index = i;
1469 }
1470 if (lib_arch.code == arch_array[i].code) {
1471 lib_arch.compat_class = arch_array[i].compat_class;
1472 lib_arch.name = arch_array[i].name;
1473 }
1474 }
1475
1476 assert(running_arch_index != -1,
1477 "Didn't find running architecture code (running_arch_code) in arch_array");
1478 if (running_arch_index == -1) {
1479 // Even though running architecture detection failed
1480 // we may still continue with reporting dlerror() message
1481 return NULL;
1482 }
1483
1484 if (lib_arch.endianess != arch_array[running_arch_index].endianess) {
1485 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)");
1486 return NULL;
1487 }
1488
1489 #ifndef S390
1490 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) {
1491 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)");
1492 return NULL;
1493 }
1494 #endif // !S390
1495
1496 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) {
1497 if ( lib_arch.name!=NULL ) {
1498 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1499 " (Possible cause: can't load %s-bit .so on a %s-bit platform)",
1500 lib_arch.name, arch_array[running_arch_index].name);
1501 } else {
1502 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1503 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)",
1504 lib_arch.code,
1505 arch_array[running_arch_index].name);
1506 }
1507 }
1508
1509 return NULL;
1510 }
1511 #endif /* !__APPLE__ */
1512
1513 // XXX: Do we need a lock around this as per Linux?
1514 void* os::dll_lookup(void* handle, const char* name) {
1515 return dlsym(handle, name);
1516 }
1517
1518
1519 static bool _print_ascii_file(const char* filename, outputStream* st) {
1520 int fd = ::open(filename, O_RDONLY);
1521 if (fd == -1) {
1522 return false;
1523 }
1524
1525 char buf[32];
1526 int bytes;
1527 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) {
1528 st->print_raw(buf, bytes);
1529 }
1530
1531 ::close(fd);
1532
1533 return true;
1534 }
1535
1536 void os::print_dll_info(outputStream *st) {
1537 st->print_cr("Dynamic libraries:");
1538 #ifdef RTLD_DI_LINKMAP
1539 Dl_info dli;
1540 void *handle;
1541 Link_map *map;
1542 Link_map *p;
1543
1544 if (!dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli)) {
1545 st->print_cr("Error: Cannot print dynamic libraries.");
1546 return;
1547 }
1548 handle = dlopen(dli.dli_fname, RTLD_LAZY);
1549 if (handle == NULL) {
1550 st->print_cr("Error: Cannot print dynamic libraries.");
1551 return;
1552 }
1553 dlinfo(handle, RTLD_DI_LINKMAP, &map);
1554 if (map == NULL) {
1555 st->print_cr("Error: Cannot print dynamic libraries.");
1556 return;
1557 }
1558
1559 while (map->l_prev != NULL)
1560 map = map->l_prev;
1561
1562 while (map != NULL) {
1563 st->print_cr(PTR_FORMAT " \t%s", map->l_addr, map->l_name);
1564 map = map->l_next;
1565 }
1566
1567 dlclose(handle);
1568 #elif defined(__APPLE__)
1569 uint32_t count;
1570 uint32_t i;
1571
1572 count = _dyld_image_count();
1573 for (i = 1; i < count; i++) {
1574 const char *name = _dyld_get_image_name(i);
1575 intptr_t slide = _dyld_get_image_vmaddr_slide(i);
1576 st->print_cr(PTR_FORMAT " \t%s", slide, name);
1577 }
1578 #else
1579 st->print_cr("Error: Cannot print dynamic libraries.");
1580 #endif
1581 }
1582
1583 void os::print_os_info_brief(outputStream* st) {
1584 st->print("Bsd");
1585
1586 os::Posix::print_uname_info(st);
1587 }
1588
1589 void os::print_os_info(outputStream* st) {
1590 st->print("OS:");
1591 st->print("Bsd");
1592
1593 os::Posix::print_uname_info(st);
1594
1595 os::Posix::print_rlimit_info(st);
1596
1597 os::Posix::print_load_average(st);
1598 }
1599
1600 void os::pd_print_cpu_info(outputStream* st) {
1601 // Nothing to do for now.
1602 }
1603
1604 void os::print_memory_info(outputStream* st) {
1605
1606 st->print("Memory:");
1607 st->print(" %dk page", os::vm_page_size()>>10);
1608
1609 st->print(", physical " UINT64_FORMAT "k",
1610 os::physical_memory() >> 10);
1611 st->print("(" UINT64_FORMAT "k free)",
1612 os::available_memory() >> 10);
1613 st->cr();
1614
1615 // meminfo
1616 st->print("\n/proc/meminfo:\n");
1617 _print_ascii_file("/proc/meminfo", st);
1618 st->cr();
1619 }
1620
1621 // Taken from /usr/include/bits/siginfo.h Supposed to be architecture specific
1622 // but they're the same for all the bsd arch that we support
1623 // and they're the same for solaris but there's no common place to put this.
1624 const char *ill_names[] = { "ILL0", "ILL_ILLOPC", "ILL_ILLOPN", "ILL_ILLADR",
1625 "ILL_ILLTRP", "ILL_PRVOPC", "ILL_PRVREG",
1626 "ILL_COPROC", "ILL_BADSTK" };
1627
1628 const char *fpe_names[] = { "FPE0", "FPE_INTDIV", "FPE_INTOVF", "FPE_FLTDIV",
1629 "FPE_FLTOVF", "FPE_FLTUND", "FPE_FLTRES",
1630 "FPE_FLTINV", "FPE_FLTSUB", "FPE_FLTDEN" };
1631
1632 const char *segv_names[] = { "SEGV0", "SEGV_MAPERR", "SEGV_ACCERR" };
1633
1634 const char *bus_names[] = { "BUS0", "BUS_ADRALN", "BUS_ADRERR", "BUS_OBJERR" };
1635
1636 void os::print_siginfo(outputStream* st, void* siginfo) {
1637 st->print("siginfo:");
1638
1639 const int buflen = 100;
1640 char buf[buflen];
1641 siginfo_t *si = (siginfo_t*)siginfo;
1642 st->print("si_signo=%s: ", os::exception_name(si->si_signo, buf, buflen));
1643 if (si->si_errno != 0 && strerror_r(si->si_errno, buf, buflen) == 0) {
1644 st->print("si_errno=%s", buf);
1645 } else {
1646 st->print("si_errno=%d", si->si_errno);
1647 }
1648 const int c = si->si_code;
1649 assert(c > 0, "unexpected si_code");
1650 switch (si->si_signo) {
1651 case SIGILL:
1652 st->print(", si_code=%d (%s)", c, c > 8 ? "" : ill_names[c]);
1653 st->print(", si_addr=" PTR_FORMAT, si->si_addr);
1654 break;
1655 case SIGFPE:
1656 st->print(", si_code=%d (%s)", c, c > 9 ? "" : fpe_names[c]);
1657 st->print(", si_addr=" PTR_FORMAT, si->si_addr);
1658 break;
1659 case SIGSEGV:
1660 st->print(", si_code=%d (%s)", c, c > 2 ? "" : segv_names[c]);
1661 st->print(", si_addr=" PTR_FORMAT, si->si_addr);
1662 break;
1663 case SIGBUS:
1664 st->print(", si_code=%d (%s)", c, c > 3 ? "" : bus_names[c]);
1665 st->print(", si_addr=" PTR_FORMAT, si->si_addr);
1666 break;
1667 default:
1668 st->print(", si_code=%d", si->si_code);
1669 // no si_addr
1670 }
1671
1672 if ((si->si_signo == SIGBUS || si->si_signo == SIGSEGV) &&
1673 UseSharedSpaces) {
1674 FileMapInfo* mapinfo = FileMapInfo::current_info();
1675 if (mapinfo->is_in_shared_space(si->si_addr)) {
1676 st->print("\n\nError accessing class data sharing archive." \
1677 " Mapped file inaccessible during execution, " \
1678 " possible disk/network problem.");
1679 }
1680 }
1681 st->cr();
1682 }
1683
1684
1685 static void print_signal_handler(outputStream* st, int sig,
1686 char* buf, size_t buflen);
1687
1688 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1689 st->print_cr("Signal Handlers:");
1690 print_signal_handler(st, SIGSEGV, buf, buflen);
1691 print_signal_handler(st, SIGBUS , buf, buflen);
1692 print_signal_handler(st, SIGFPE , buf, buflen);
1693 print_signal_handler(st, SIGPIPE, buf, buflen);
1694 print_signal_handler(st, SIGXFSZ, buf, buflen);
1695 print_signal_handler(st, SIGILL , buf, buflen);
1696 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen);
1697 print_signal_handler(st, SR_signum, buf, buflen);
1698 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen);
1699 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
1700 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen);
1701 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
1702 }
1703
1704 static char saved_jvm_path[MAXPATHLEN] = {0};
1705
1706 // Find the full path to the current module, libjvm or libjvm_g
1707 void os::jvm_path(char *buf, jint buflen) {
1708 // Error checking.
1709 if (buflen < MAXPATHLEN) {
1710 assert(false, "must use a large-enough buffer");
1711 buf[0] = '\0';
1712 return;
1713 }
1714 // Lazy resolve the path to current module.
1715 if (saved_jvm_path[0] != 0) {
1716 strcpy(buf, saved_jvm_path);
1717 return;
1718 }
1719
1720 char dli_fname[MAXPATHLEN];
1721 bool ret = dll_address_to_library_name(
1722 CAST_FROM_FN_PTR(address, os::jvm_path),
1723 dli_fname, sizeof(dli_fname), NULL);
1724 assert(ret != 0, "cannot locate libjvm");
1725 char *rp = realpath(dli_fname, buf);
1726 if (rp == NULL)
1727 return;
1728
1729 if (Arguments::created_by_gamma_launcher()) {
1730 // Support for the gamma launcher. Typical value for buf is
1731 // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm". If "/jre/lib/" appears at
1732 // the right place in the string, then assume we are installed in a JDK and
1733 // we're done. Otherwise, check for a JAVA_HOME environment variable and
1734 // construct a path to the JVM being overridden.
1735
1736 const char *p = buf + strlen(buf) - 1;
1737 for (int count = 0; p > buf && count < 5; ++count) {
1738 for (--p; p > buf && *p != '/'; --p)
1739 /* empty */ ;
1740 }
1741
1742 if (strncmp(p, "/jre/lib/", 9) != 0) {
1743 // Look for JAVA_HOME in the environment.
1744 char* java_home_var = ::getenv("JAVA_HOME");
1745 if (java_home_var != NULL && java_home_var[0] != 0) {
1746 char* jrelib_p;
1747 int len;
1748
1749 // Check the current module name "libjvm" or "libjvm_g".
1750 p = strrchr(buf, '/');
1751 assert(strstr(p, "/libjvm") == p, "invalid library name");
1752 p = strstr(p, "_g") ? "_g" : "";
1753
1754 rp = realpath(java_home_var, buf);
1755 if (rp == NULL)
1756 return;
1757
1758 // determine if this is a legacy image or modules image
1759 // modules image doesn't have "jre" subdirectory
1760 len = strlen(buf);
1761 jrelib_p = buf + len;
1762
1763 // Add the appropriate library subdir
1764 snprintf(jrelib_p, buflen-len, "/jre/lib");
1765 if (0 != access(buf, F_OK)) {
1766 snprintf(jrelib_p, buflen-len, "/lib");
1767 }
1768
1769 // Add the appropriate client or server subdir
1770 len = strlen(buf);
1771 jrelib_p = buf + len;
1772 snprintf(jrelib_p, buflen-len, "/%s", COMPILER_VARIANT);
1773 if (0 != access(buf, F_OK)) {
1774 snprintf(jrelib_p, buflen-len, "");
1775 }
1776
1777 // If the path exists within JAVA_HOME, add the JVM library name
1778 // to complete the path to JVM being overridden. Otherwise fallback
1779 // to the path to the current library.
1780 if (0 == access(buf, F_OK)) {
1781 // Use current module name "libjvm[_g]" instead of
1782 // "libjvm"debug_only("_g")"" since for fastdebug version
1783 // we should have "libjvm" but debug_only("_g") adds "_g"!
1784 len = strlen(buf);
1785 snprintf(buf + len, buflen-len, "/libjvm%s%s", p, JNI_LIB_SUFFIX);
1786 } else {
1787 // Fall back to path of current library
1788 rp = realpath(dli_fname, buf);
1789 if (rp == NULL)
1790 return;
1791 }
1792 }
1793 }
1794 }
1795
1796 strcpy(saved_jvm_path, buf);
1797 }
1798
1799 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1800 // no prefix required, not even "_"
1801 }
1802
1803 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1804 // no suffix required
1805 }
1806
1807 ////////////////////////////////////////////////////////////////////////////////
1808 // sun.misc.Signal support
1809
1810 static volatile jint sigint_count = 0;
1811
1812 static void
1813 UserHandler(int sig, void *siginfo, void *context) {
1814 // 4511530 - sem_post is serialized and handled by the manager thread. When
1815 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We
1816 // don't want to flood the manager thread with sem_post requests.
1817 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1)
1818 return;
1819
1820 // Ctrl-C is pressed during error reporting, likely because the error
1821 // handler fails to abort. Let VM die immediately.
1822 if (sig == SIGINT && is_error_reported()) {
1823 os::die();
1824 }
1825
1826 os::signal_notify(sig);
1827 }
1828
1829 void* os::user_handler() {
1830 return CAST_FROM_FN_PTR(void*, UserHandler);
1831 }
1832
1833 extern "C" {
1834 typedef void (*sa_handler_t)(int);
1835 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
1836 }
1837
1838 void* os::signal(int signal_number, void* handler) {
1839 struct sigaction sigAct, oldSigAct;
1840
1841 sigfillset(&(sigAct.sa_mask));
1842 sigAct.sa_flags = SA_RESTART|SA_SIGINFO;
1843 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
1844
1845 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
1846 // -1 means registration failed
1847 return (void *)-1;
1848 }
1849
1850 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
1851 }
1852
1853 void os::signal_raise(int signal_number) {
1854 ::raise(signal_number);
1855 }
1856
1857 /*
1858 * The following code is moved from os.cpp for making this
1859 * code platform specific, which it is by its very nature.
1860 */
1861
1862 // Will be modified when max signal is changed to be dynamic
1863 int os::sigexitnum_pd() {
1864 return NSIG;
1865 }
1866
1867 // a counter for each possible signal value
1868 static volatile jint pending_signals[NSIG+1] = { 0 };
1869
1870 // Bsd(POSIX) specific hand shaking semaphore.
1871 #ifdef __APPLE__
1872 static semaphore_t sig_sem;
1873 #define SEM_INIT(sem, value) semaphore_create(mach_task_self(), &sem, SYNC_POLICY_FIFO, value)
1874 #define SEM_WAIT(sem) semaphore_wait(sem);
1875 #define SEM_POST(sem) semaphore_signal(sem);
1876 #else
1877 static sem_t sig_sem;
1878 #define SEM_INIT(sem, value) sem_init(&sem, 0, value)
1879 #define SEM_WAIT(sem) sem_wait(&sem);
1880 #define SEM_POST(sem) sem_post(&sem);
1881 #endif
1882
1883 void os::signal_init_pd() {
1884 // Initialize signal structures
1885 ::memset((void*)pending_signals, 0, sizeof(pending_signals));
1886
1887 // Initialize signal semaphore
1888 ::SEM_INIT(sig_sem, 0);
1889 }
1890
1891 void os::signal_notify(int sig) {
1892 Atomic::inc(&pending_signals[sig]);
1893 ::SEM_POST(sig_sem);
1894 }
1895
1896 static int check_pending_signals(bool wait) {
1897 Atomic::store(0, &sigint_count);
1898 for (;;) {
1899 for (int i = 0; i < NSIG + 1; i++) {
1900 jint n = pending_signals[i];
1901 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
1902 return i;
1903 }
1904 }
1905 if (!wait) {
1906 return -1;
1907 }
1908 JavaThread *thread = JavaThread::current();
1909 ThreadBlockInVM tbivm(thread);
1910
1911 bool threadIsSuspended;
1912 do {
1913 thread->set_suspend_equivalent();
1914 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
1915 ::SEM_WAIT(sig_sem);
1916
1917 // were we externally suspended while we were waiting?
1918 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
1919 if (threadIsSuspended) {
1920 //
1921 // The semaphore has been incremented, but while we were waiting
1922 // another thread suspended us. We don't want to continue running
1923 // while suspended because that would surprise the thread that
1924 // suspended us.
1925 //
1926 ::SEM_POST(sig_sem);
1927
1928 thread->java_suspend_self();
1929 }
1930 } while (threadIsSuspended);
1931 }
1932 }
1933
1934 int os::signal_lookup() {
1935 return check_pending_signals(false);
1936 }
1937
1938 int os::signal_wait() {
1939 return check_pending_signals(true);
1940 }
1941
1942 ////////////////////////////////////////////////////////////////////////////////
1943 // Virtual Memory
1944
1945 int os::vm_page_size() {
1946 // Seems redundant as all get out
1947 assert(os::Bsd::page_size() != -1, "must call os::init");
1948 return os::Bsd::page_size();
1949 }
1950
1951 // Solaris allocates memory by pages.
1952 int os::vm_allocation_granularity() {
1953 assert(os::Bsd::page_size() != -1, "must call os::init");
1954 return os::Bsd::page_size();
1955 }
1956
1957 // Rationale behind this function:
1958 // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable
1959 // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get
1960 // samples for JITted code. Here we create private executable mapping over the code cache
1961 // and then we can use standard (well, almost, as mapping can change) way to provide
1962 // info for the reporting script by storing timestamp and location of symbol
1963 void bsd_wrap_code(char* base, size_t size) {
1964 static volatile jint cnt = 0;
1965
1966 if (!UseOprofile) {
1967 return;
1968 }
1969
1970 char buf[PATH_MAX + 1];
1971 int num = Atomic::add(1, &cnt);
1972
1973 snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d",
1974 os::get_temp_directory(), os::current_process_id(), num);
1975 unlink(buf);
1976
1977 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU);
1978
1979 if (fd != -1) {
1980 off_t rv = ::lseek(fd, size-2, SEEK_SET);
1981 if (rv != (off_t)-1) {
1982 if (::write(fd, "", 1) == 1) {
1983 mmap(base, size,
1984 PROT_READ|PROT_WRITE|PROT_EXEC,
1985 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0);
1986 }
1987 }
1988 ::close(fd);
1989 unlink(buf);
1990 }
1991 }
1992
1993 // NOTE: Bsd kernel does not really reserve the pages for us.
1994 // All it does is to check if there are enough free pages
1995 // left at the time of mmap(). This could be a potential
1996 // problem.
1997 bool os::pd_commit_memory(char* addr, size_t size, bool exec) {
1998 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
1999 #ifdef __OpenBSD__
2000 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD
2001 return ::mprotect(addr, size, prot) == 0;
2002 #else
2003 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot,
2004 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0);
2005 return res != (uintptr_t) MAP_FAILED;
2006 #endif
2007 }
2008
2009
2010 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
2011 bool exec) {
2012 return commit_memory(addr, size, exec);
2013 }
2014
2015 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2016 }
2017
2018 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) {
2019 ::madvise(addr, bytes, MADV_DONTNEED);
2020 }
2021
2022 void os::numa_make_global(char *addr, size_t bytes) {
2023 }
2024
2025 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2026 }
2027
2028 bool os::numa_topology_changed() { return false; }
2029
2030 size_t os::numa_get_groups_num() {
2031 return 1;
2032 }
2033
2034 int os::numa_get_group_id() {
2035 return 0;
2036 }
2037
2038 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2039 if (size > 0) {
2040 ids[0] = 0;
2041 return 1;
2042 }
2043 return 0;
2044 }
2045
2046 bool os::get_page_info(char *start, page_info* info) {
2047 return false;
2048 }
2049
2050 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2051 return end;
2052 }
2053
2054
2055 bool os::pd_uncommit_memory(char* addr, size_t size) {
2056 #ifdef __OpenBSD__
2057 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD
2058 return ::mprotect(addr, size, PROT_NONE) == 0;
2059 #else
2060 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE,
2061 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0);
2062 return res != (uintptr_t) MAP_FAILED;
2063 #endif
2064 }
2065
2066 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2067 return os::commit_memory(addr, size);
2068 }
2069
2070 // If this is a growable mapping, remove the guard pages entirely by
2071 // munmap()ping them. If not, just call uncommit_memory().
2072 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2073 return os::uncommit_memory(addr, size);
2074 }
2075
2076 static address _highest_vm_reserved_address = NULL;
2077
2078 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory
2079 // at 'requested_addr'. If there are existing memory mappings at the same
2080 // location, however, they will be overwritten. If 'fixed' is false,
2081 // 'requested_addr' is only treated as a hint, the return value may or
2082 // may not start from the requested address. Unlike Bsd mmap(), this
2083 // function returns NULL to indicate failure.
2084 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) {
2085 char * addr;
2086 int flags;
2087
2088 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS;
2089 if (fixed) {
2090 assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address");
2091 flags |= MAP_FIXED;
2092 }
2093
2094 // Map uncommitted pages PROT_READ and PROT_WRITE, change access
2095 // to PROT_EXEC if executable when we commit the page.
2096 addr = (char*)::mmap(requested_addr, bytes, PROT_READ|PROT_WRITE,
2097 flags, -1, 0);
2098
2099 if (addr != MAP_FAILED) {
2100 // anon_mmap() should only get called during VM initialization,
2101 // don't need lock (actually we can skip locking even it can be called
2102 // from multiple threads, because _highest_vm_reserved_address is just a
2103 // hint about the upper limit of non-stack memory regions.)
2104 if ((address)addr + bytes > _highest_vm_reserved_address) {
2105 _highest_vm_reserved_address = (address)addr + bytes;
2106 }
2107 }
2108
2109 return addr == MAP_FAILED ? NULL : addr;
2110 }
2111
2112 // Don't update _highest_vm_reserved_address, because there might be memory
2113 // regions above addr + size. If so, releasing a memory region only creates
2114 // a hole in the address space, it doesn't help prevent heap-stack collision.
2115 //
2116 static int anon_munmap(char * addr, size_t size) {
2117 return ::munmap(addr, size) == 0;
2118 }
2119
2120 char* os::pd_reserve_memory(size_t bytes, char* requested_addr,
2121 size_t alignment_hint) {
2122 return anon_mmap(requested_addr, bytes, (requested_addr != NULL));
2123 }
2124
2125 bool os::pd_release_memory(char* addr, size_t size) {
2126 return anon_munmap(addr, size);
2127 }
2128
2129 static address highest_vm_reserved_address() {
2130 return _highest_vm_reserved_address;
2131 }
2132
2133 static bool bsd_mprotect(char* addr, size_t size, int prot) {
2134 // Bsd wants the mprotect address argument to be page aligned.
2135 char* bottom = (char*)align_size_down((intptr_t)addr, os::Bsd::page_size());
2136
2137 // According to SUSv3, mprotect() should only be used with mappings
2138 // established by mmap(), and mmap() always maps whole pages. Unaligned
2139 // 'addr' likely indicates problem in the VM (e.g. trying to change
2140 // protection of malloc'ed or statically allocated memory). Check the
2141 // caller if you hit this assert.
2142 assert(addr == bottom, "sanity check");
2143
2144 size = align_size_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size());
2145 return ::mprotect(bottom, size, prot) == 0;
2146 }
2147
2148 // Set protections specified
2149 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
2150 bool is_committed) {
2151 unsigned int p = 0;
2152 switch (prot) {
2153 case MEM_PROT_NONE: p = PROT_NONE; break;
2154 case MEM_PROT_READ: p = PROT_READ; break;
2155 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2156 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2157 default:
2158 ShouldNotReachHere();
2159 }
2160 // is_committed is unused.
2161 return bsd_mprotect(addr, bytes, p);
2162 }
2163
2164 bool os::guard_memory(char* addr, size_t size) {
2165 return bsd_mprotect(addr, size, PROT_NONE);
2166 }
2167
2168 bool os::unguard_memory(char* addr, size_t size) {
2169 return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE);
2170 }
2171
2172 bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) {
2173 return false;
2174 }
2175
2176 /*
2177 * Set the coredump_filter bits to include largepages in core dump (bit 6)
2178 *
2179 * From the coredump_filter documentation:
2180 *
2181 * - (bit 0) anonymous private memory
2182 * - (bit 1) anonymous shared memory
2183 * - (bit 2) file-backed private memory
2184 * - (bit 3) file-backed shared memory
2185 * - (bit 4) ELF header pages in file-backed private memory areas (it is
2186 * effective only if the bit 2 is cleared)
2187 * - (bit 5) hugetlb private memory
2188 * - (bit 6) hugetlb shared memory
2189 */
2190 static void set_coredump_filter(void) {
2191 FILE *f;
2192 long cdm;
2193
2194 if ((f = fopen("/proc/self/coredump_filter", "r+")) == NULL) {
2195 return;
2196 }
2197
2198 if (fscanf(f, "%lx", &cdm) != 1) {
2199 fclose(f);
2200 return;
2201 }
2202
2203 rewind(f);
2204
2205 if ((cdm & LARGEPAGES_BIT) == 0) {
2206 cdm |= LARGEPAGES_BIT;
2207 fprintf(f, "%#lx", cdm);
2208 }
2209
2210 fclose(f);
2211 }
2212
2213 // Large page support
2214
2215 static size_t _large_page_size = 0;
2216
2217 void os::large_page_init() {
2218 }
2219
2220
2221 char* os::reserve_memory_special(size_t bytes, char* req_addr, bool exec) {
2222 // "exec" is passed in but not used. Creating the shared image for
2223 // the code cache doesn't have an SHM_X executable permission to check.
2224 assert(UseLargePages && UseSHM, "only for SHM large pages");
2225
2226 key_t key = IPC_PRIVATE;
2227 char *addr;
2228
2229 bool warn_on_failure = UseLargePages &&
2230 (!FLAG_IS_DEFAULT(UseLargePages) ||
2231 !FLAG_IS_DEFAULT(LargePageSizeInBytes)
2232 );
2233 char msg[128];
2234
2235 // Create a large shared memory region to attach to based on size.
2236 // Currently, size is the total size of the heap
2237 int shmid = shmget(key, bytes, IPC_CREAT|SHM_R|SHM_W);
2238 if (shmid == -1) {
2239 // Possible reasons for shmget failure:
2240 // 1. shmmax is too small for Java heap.
2241 // > check shmmax value: cat /proc/sys/kernel/shmmax
2242 // > increase shmmax value: echo "0xffffffff" > /proc/sys/kernel/shmmax
2243 // 2. not enough large page memory.
2244 // > check available large pages: cat /proc/meminfo
2245 // > increase amount of large pages:
2246 // echo new_value > /proc/sys/vm/nr_hugepages
2247 // Note 1: different Bsd may use different name for this property,
2248 // e.g. on Redhat AS-3 it is "hugetlb_pool".
2249 // Note 2: it's possible there's enough physical memory available but
2250 // they are so fragmented after a long run that they can't
2251 // coalesce into large pages. Try to reserve large pages when
2252 // the system is still "fresh".
2253 if (warn_on_failure) {
2254 jio_snprintf(msg, sizeof(msg), "Failed to reserve shared memory (errno = %d).", errno);
2255 warning(msg);
2256 }
2257 return NULL;
2258 }
2259
2260 // attach to the region
2261 addr = (char*)shmat(shmid, req_addr, 0);
2262 int err = errno;
2263
2264 // Remove shmid. If shmat() is successful, the actual shared memory segment
2265 // will be deleted when it's detached by shmdt() or when the process
2266 // terminates. If shmat() is not successful this will remove the shared
2267 // segment immediately.
2268 shmctl(shmid, IPC_RMID, NULL);
2269
2270 if ((intptr_t)addr == -1) {
2271 if (warn_on_failure) {
2272 jio_snprintf(msg, sizeof(msg), "Failed to attach shared memory (errno = %d).", err);
2273 warning(msg);
2274 }
2275 return NULL;
2276 }
2277
2278 return addr;
2279 }
2280
2281 bool os::release_memory_special(char* base, size_t bytes) {
2282 // detaching the SHM segment will also delete it, see reserve_memory_special()
2283 int rslt = shmdt(base);
2284 return rslt == 0;
2285 }
2286
2287 size_t os::large_page_size() {
2288 return _large_page_size;
2289 }
2290
2291 // HugeTLBFS allows application to commit large page memory on demand;
2292 // with SysV SHM the entire memory region must be allocated as shared
2293 // memory.
2294 bool os::can_commit_large_page_memory() {
2295 return UseHugeTLBFS;
2296 }
2297
2298 bool os::can_execute_large_page_memory() {
2299 return UseHugeTLBFS;
2300 }
2301
2302 // Reserve memory at an arbitrary address, only if that area is
2303 // available (and not reserved for something else).
2304
2305 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2306 const int max_tries = 10;
2307 char* base[max_tries];
2308 size_t size[max_tries];
2309 const size_t gap = 0x000000;
2310
2311 // Assert only that the size is a multiple of the page size, since
2312 // that's all that mmap requires, and since that's all we really know
2313 // about at this low abstraction level. If we need higher alignment,
2314 // we can either pass an alignment to this method or verify alignment
2315 // in one of the methods further up the call chain. See bug 5044738.
2316 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
2317
2318 // Repeatedly allocate blocks until the block is allocated at the
2319 // right spot. Give up after max_tries. Note that reserve_memory() will
2320 // automatically update _highest_vm_reserved_address if the call is
2321 // successful. The variable tracks the highest memory address every reserved
2322 // by JVM. It is used to detect heap-stack collision if running with
2323 // fixed-stack BsdThreads. Because here we may attempt to reserve more
2324 // space than needed, it could confuse the collision detecting code. To
2325 // solve the problem, save current _highest_vm_reserved_address and
2326 // calculate the correct value before return.
2327 address old_highest = _highest_vm_reserved_address;
2328
2329 // Bsd mmap allows caller to pass an address as hint; give it a try first,
2330 // if kernel honors the hint then we can return immediately.
2331 char * addr = anon_mmap(requested_addr, bytes, false);
2332 if (addr == requested_addr) {
2333 return requested_addr;
2334 }
2335
2336 if (addr != NULL) {
2337 // mmap() is successful but it fails to reserve at the requested address
2338 anon_munmap(addr, bytes);
2339 }
2340
2341 int i;
2342 for (i = 0; i < max_tries; ++i) {
2343 base[i] = reserve_memory(bytes);
2344
2345 if (base[i] != NULL) {
2346 // Is this the block we wanted?
2347 if (base[i] == requested_addr) {
2348 size[i] = bytes;
2349 break;
2350 }
2351
2352 // Does this overlap the block we wanted? Give back the overlapped
2353 // parts and try again.
2354
2355 size_t top_overlap = requested_addr + (bytes + gap) - base[i];
2356 if (top_overlap >= 0 && top_overlap < bytes) {
2357 unmap_memory(base[i], top_overlap);
2358 base[i] += top_overlap;
2359 size[i] = bytes - top_overlap;
2360 } else {
2361 size_t bottom_overlap = base[i] + bytes - requested_addr;
2362 if (bottom_overlap >= 0 && bottom_overlap < bytes) {
2363 unmap_memory(requested_addr, bottom_overlap);
2364 size[i] = bytes - bottom_overlap;
2365 } else {
2366 size[i] = bytes;
2367 }
2368 }
2369 }
2370 }
2371
2372 // Give back the unused reserved pieces.
2373
2374 for (int j = 0; j < i; ++j) {
2375 if (base[j] != NULL) {
2376 unmap_memory(base[j], size[j]);
2377 }
2378 }
2379
2380 if (i < max_tries) {
2381 _highest_vm_reserved_address = MAX2(old_highest, (address)requested_addr + bytes);
2382 return requested_addr;
2383 } else {
2384 _highest_vm_reserved_address = old_highest;
2385 return NULL;
2386 }
2387 }
2388
2389 size_t os::read(int fd, void *buf, unsigned int nBytes) {
2390 RESTARTABLE_RETURN_INT(::read(fd, buf, nBytes));
2391 }
2392
2393 // TODO-FIXME: reconcile Solaris' os::sleep with the bsd variation.
2394 // Solaris uses poll(), bsd uses park().
2395 // Poll() is likely a better choice, assuming that Thread.interrupt()
2396 // generates a SIGUSRx signal. Note that SIGUSR1 can interfere with
2397 // SIGSEGV, see 4355769.
2398
2399 int os::sleep(Thread* thread, jlong millis, bool interruptible) {
2400 assert(thread == Thread::current(), "thread consistency check");
2401
2402 ParkEvent * const slp = thread->_SleepEvent ;
2403 slp->reset() ;
2404 OrderAccess::fence() ;
2405
2406 if (interruptible) {
2407 jlong prevtime = javaTimeNanos();
2408
2409 for (;;) {
2410 if (os::is_interrupted(thread, true)) {
2411 return OS_INTRPT;
2412 }
2413
2414 jlong newtime = javaTimeNanos();
2415
2416 if (newtime - prevtime < 0) {
2417 // time moving backwards, should only happen if no monotonic clock
2418 // not a guarantee() because JVM should not abort on kernel/glibc bugs
2419 assert(!Bsd::supports_monotonic_clock(), "time moving backwards");
2420 } else {
2421 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC;
2422 }
2423
2424 if(millis <= 0) {
2425 return OS_OK;
2426 }
2427
2428 prevtime = newtime;
2429
2430 {
2431 assert(thread->is_Java_thread(), "sanity check");
2432 JavaThread *jt = (JavaThread *) thread;
2433 ThreadBlockInVM tbivm(jt);
2434 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */);
2435
2436 jt->set_suspend_equivalent();
2437 // cleared by handle_special_suspend_equivalent_condition() or
2438 // java_suspend_self() via check_and_wait_while_suspended()
2439
2440 slp->park(millis);
2441
2442 // were we externally suspended while we were waiting?
2443 jt->check_and_wait_while_suspended();
2444 }
2445 }
2446 } else {
2447 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
2448 jlong prevtime = javaTimeNanos();
2449
2450 for (;;) {
2451 // It'd be nice to avoid the back-to-back javaTimeNanos() calls on
2452 // the 1st iteration ...
2453 jlong newtime = javaTimeNanos();
2454
2455 if (newtime - prevtime < 0) {
2456 // time moving backwards, should only happen if no monotonic clock
2457 // not a guarantee() because JVM should not abort on kernel/glibc bugs
2458 assert(!Bsd::supports_monotonic_clock(), "time moving backwards");
2459 } else {
2460 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC;
2461 }
2462
2463 if(millis <= 0) break ;
2464
2465 prevtime = newtime;
2466 slp->park(millis);
2467 }
2468 return OS_OK ;
2469 }
2470 }
2471
2472 int os::naked_sleep() {
2473 // %% make the sleep time an integer flag. for now use 1 millisec.
2474 return os::sleep(Thread::current(), 1, false);
2475 }
2476
2477 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2478 void os::infinite_sleep() {
2479 while (true) { // sleep forever ...
2480 ::sleep(100); // ... 100 seconds at a time
2481 }
2482 }
2483
2484 // Used to convert frequent JVM_Yield() to nops
2485 bool os::dont_yield() {
2486 return DontYieldALot;
2487 }
2488
2489 void os::yield() {
2490 sched_yield();
2491 }
2492
2493 os::YieldResult os::NakedYield() { sched_yield(); return os::YIELD_UNKNOWN ;}
2494
2495 void os::yield_all(int attempts) {
2496 // Yields to all threads, including threads with lower priorities
2497 // Threads on Bsd are all with same priority. The Solaris style
2498 // os::yield_all() with nanosleep(1ms) is not necessary.
2499 sched_yield();
2500 }
2501
2502 // Called from the tight loops to possibly influence time-sharing heuristics
2503 void os::loop_breaker(int attempts) {
2504 os::yield_all(attempts);
2505 }
2506
2507 ////////////////////////////////////////////////////////////////////////////////
2508 // thread priority support
2509
2510 // Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER
2511 // only supports dynamic priority, static priority must be zero. For real-time
2512 // applications, Bsd supports SCHED_RR which allows static priority (1-99).
2513 // However, for large multi-threaded applications, SCHED_RR is not only slower
2514 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out
2515 // of 5 runs - Sep 2005).
2516 //
2517 // The following code actually changes the niceness of kernel-thread/LWP. It
2518 // has an assumption that setpriority() only modifies one kernel-thread/LWP,
2519 // not the entire user process, and user level threads are 1:1 mapped to kernel
2520 // threads. It has always been the case, but could change in the future. For
2521 // this reason, the code should not be used as default (ThreadPriorityPolicy=0).
2522 // It is only used when ThreadPriorityPolicy=1 and requires root privilege.
2523
2524 #if !defined(__APPLE__)
2525 int os::java_to_os_priority[CriticalPriority + 1] = {
2526 19, // 0 Entry should never be used
2527
2528 0, // 1 MinPriority
2529 3, // 2
2530 6, // 3
2531
2532 10, // 4
2533 15, // 5 NormPriority
2534 18, // 6
2535
2536 21, // 7
2537 25, // 8
2538 28, // 9 NearMaxPriority
2539
2540 31, // 10 MaxPriority
2541
2542 31 // 11 CriticalPriority
2543 };
2544 #else
2545 /* Using Mach high-level priority assignments */
2546 int os::java_to_os_priority[CriticalPriority + 1] = {
2547 0, // 0 Entry should never be used (MINPRI_USER)
2548
2549 27, // 1 MinPriority
2550 28, // 2
2551 29, // 3
2552
2553 30, // 4
2554 31, // 5 NormPriority (BASEPRI_DEFAULT)
2555 32, // 6
2556
2557 33, // 7
2558 34, // 8
2559 35, // 9 NearMaxPriority
2560
2561 36, // 10 MaxPriority
2562
2563 36 // 11 CriticalPriority
2564 };
2565 #endif
2566
2567 static int prio_init() {
2568 if (ThreadPriorityPolicy == 1) {
2569 // Only root can raise thread priority. Don't allow ThreadPriorityPolicy=1
2570 // if effective uid is not root. Perhaps, a more elegant way of doing
2571 // this is to test CAP_SYS_NICE capability, but that will require libcap.so
2572 if (geteuid() != 0) {
2573 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) {
2574 warning("-XX:ThreadPriorityPolicy requires root privilege on Bsd");
2575 }
2576 ThreadPriorityPolicy = 0;
2577 }
2578 }
2579 if (UseCriticalJavaThreadPriority) {
2580 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
2581 }
2582 return 0;
2583 }
2584
2585 OSReturn os::set_native_priority(Thread* thread, int newpri) {
2586 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) return OS_OK;
2587
2588 #ifdef __OpenBSD__
2589 // OpenBSD pthread_setprio starves low priority threads
2590 return OS_OK;
2591 #elif defined(__FreeBSD__)
2592 int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri);
2593 #elif defined(__APPLE__) || defined(__NetBSD__)
2594 struct sched_param sp;
2595 int policy;
2596 pthread_t self = pthread_self();
2597
2598 if (pthread_getschedparam(self, &policy, &sp) != 0)
2599 return OS_ERR;
2600
2601 sp.sched_priority = newpri;
2602 if (pthread_setschedparam(self, policy, &sp) != 0)
2603 return OS_ERR;
2604
2605 return OS_OK;
2606 #else
2607 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri);
2608 return (ret == 0) ? OS_OK : OS_ERR;
2609 #endif
2610 }
2611
2612 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
2613 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) {
2614 *priority_ptr = java_to_os_priority[NormPriority];
2615 return OS_OK;
2616 }
2617
2618 errno = 0;
2619 #if defined(__OpenBSD__) || defined(__FreeBSD__)
2620 *priority_ptr = pthread_getprio(thread->osthread()->pthread_id());
2621 #elif defined(__APPLE__) || defined(__NetBSD__)
2622 int policy;
2623 struct sched_param sp;
2624
2625 pthread_getschedparam(pthread_self(), &policy, &sp);
2626 *priority_ptr = sp.sched_priority;
2627 #else
2628 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id());
2629 #endif
2630 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR);
2631 }
2632
2633 // Hint to the underlying OS that a task switch would not be good.
2634 // Void return because it's a hint and can fail.
2635 void os::hint_no_preempt() {}
2636
2637 ////////////////////////////////////////////////////////////////////////////////
2638 // suspend/resume support
2639
2640 // the low-level signal-based suspend/resume support is a remnant from the
2641 // old VM-suspension that used to be for java-suspension, safepoints etc,
2642 // within hotspot. Now there is a single use-case for this:
2643 // - calling get_thread_pc() on the VMThread by the flat-profiler task
2644 // that runs in the watcher thread.
2645 // The remaining code is greatly simplified from the more general suspension
2646 // code that used to be used.
2647 //
2648 // The protocol is quite simple:
2649 // - suspend:
2650 // - sends a signal to the target thread
2651 // - polls the suspend state of the osthread using a yield loop
2652 // - target thread signal handler (SR_handler) sets suspend state
2653 // and blocks in sigsuspend until continued
2654 // - resume:
2655 // - sets target osthread state to continue
2656 // - sends signal to end the sigsuspend loop in the SR_handler
2657 //
2658 // Note that the SR_lock plays no role in this suspend/resume protocol.
2659 //
2660
2661 static void resume_clear_context(OSThread *osthread) {
2662 osthread->set_ucontext(NULL);
2663 osthread->set_siginfo(NULL);
2664
2665 // notify the suspend action is completed, we have now resumed
2666 osthread->sr.clear_suspended();
2667 }
2668
2669 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) {
2670 osthread->set_ucontext(context);
2671 osthread->set_siginfo(siginfo);
2672 }
2673
2674 //
2675 // Handler function invoked when a thread's execution is suspended or
2676 // resumed. We have to be careful that only async-safe functions are
2677 // called here (Note: most pthread functions are not async safe and
2678 // should be avoided.)
2679 //
2680 // Note: sigwait() is a more natural fit than sigsuspend() from an
2681 // interface point of view, but sigwait() prevents the signal hander
2682 // from being run. libpthread would get very confused by not having
2683 // its signal handlers run and prevents sigwait()'s use with the
2684 // mutex granting granting signal.
2685 //
2686 // Currently only ever called on the VMThread
2687 //
2688 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) {
2689 // Save and restore errno to avoid confusing native code with EINTR
2690 // after sigsuspend.
2691 int old_errno = errno;
2692
2693 Thread* thread = Thread::current();
2694 OSThread* osthread = thread->osthread();
2695 assert(thread->is_VM_thread(), "Must be VMThread");
2696 // read current suspend action
2697 int action = osthread->sr.suspend_action();
2698 if (action == SR_SUSPEND) {
2699 suspend_save_context(osthread, siginfo, context);
2700
2701 // Notify the suspend action is about to be completed. do_suspend()
2702 // waits until SR_SUSPENDED is set and then returns. We will wait
2703 // here for a resume signal and that completes the suspend-other
2704 // action. do_suspend/do_resume is always called as a pair from
2705 // the same thread - so there are no races
2706
2707 // notify the caller
2708 osthread->sr.set_suspended();
2709
2710 sigset_t suspend_set; // signals for sigsuspend()
2711
2712 // get current set of blocked signals and unblock resume signal
2713 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
2714 sigdelset(&suspend_set, SR_signum);
2715
2716 // wait here until we are resumed
2717 do {
2718 sigsuspend(&suspend_set);
2719 // ignore all returns until we get a resume signal
2720 } while (osthread->sr.suspend_action() != SR_CONTINUE);
2721
2722 resume_clear_context(osthread);
2723
2724 } else {
2725 assert(action == SR_CONTINUE, "unexpected sr action");
2726 // nothing special to do - just leave the handler
2727 }
2728
2729 errno = old_errno;
2730 }
2731
2732
2733 static int SR_initialize() {
2734 struct sigaction act;
2735 char *s;
2736 /* Get signal number to use for suspend/resume */
2737 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) {
2738 int sig = ::strtol(s, 0, 10);
2739 if (sig > 0 || sig < NSIG) {
2740 SR_signum = sig;
2741 }
2742 }
2743
2744 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS,
2745 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769");
2746
2747 sigemptyset(&SR_sigset);
2748 sigaddset(&SR_sigset, SR_signum);
2749
2750 /* Set up signal handler for suspend/resume */
2751 act.sa_flags = SA_RESTART|SA_SIGINFO;
2752 act.sa_handler = (void (*)(int)) SR_handler;
2753
2754 // SR_signum is blocked by default.
2755 // 4528190 - We also need to block pthread restart signal (32 on all
2756 // supported Bsd platforms). Note that BsdThreads need to block
2757 // this signal for all threads to work properly. So we don't have
2758 // to use hard-coded signal number when setting up the mask.
2759 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask);
2760
2761 if (sigaction(SR_signum, &act, 0) == -1) {
2762 return -1;
2763 }
2764
2765 // Save signal flag
2766 os::Bsd::set_our_sigflags(SR_signum, act.sa_flags);
2767 return 0;
2768 }
2769
2770
2771 // returns true on success and false on error - really an error is fatal
2772 // but this seems the normal response to library errors
2773 static bool do_suspend(OSThread* osthread) {
2774 // mark as suspended and send signal
2775 osthread->sr.set_suspend_action(SR_SUSPEND);
2776 int status = pthread_kill(osthread->pthread_id(), SR_signum);
2777 assert_status(status == 0, status, "pthread_kill");
2778
2779 // check status and wait until notified of suspension
2780 if (status == 0) {
2781 for (int i = 0; !osthread->sr.is_suspended(); i++) {
2782 os::yield_all(i);
2783 }
2784 osthread->sr.set_suspend_action(SR_NONE);
2785 return true;
2786 }
2787 else {
2788 osthread->sr.set_suspend_action(SR_NONE);
2789 return false;
2790 }
2791 }
2792
2793 static void do_resume(OSThread* osthread) {
2794 assert(osthread->sr.is_suspended(), "thread should be suspended");
2795 osthread->sr.set_suspend_action(SR_CONTINUE);
2796
2797 int status = pthread_kill(osthread->pthread_id(), SR_signum);
2798 assert_status(status == 0, status, "pthread_kill");
2799 // check status and wait unit notified of resumption
2800 if (status == 0) {
2801 for (int i = 0; osthread->sr.is_suspended(); i++) {
2802 os::yield_all(i);
2803 }
2804 }
2805 osthread->sr.set_suspend_action(SR_NONE);
2806 }
2807
2808 ////////////////////////////////////////////////////////////////////////////////
2809 // interrupt support
2810
2811 void os::interrupt(Thread* thread) {
2812 assert(Thread::current() == thread || Threads_lock->owned_by_self(),
2813 "possibility of dangling Thread pointer");
2814
2815 OSThread* osthread = thread->osthread();
2816
2817 if (!osthread->interrupted()) {
2818 osthread->set_interrupted(true);
2819 // More than one thread can get here with the same value of osthread,
2820 // resulting in multiple notifications. We do, however, want the store
2821 // to interrupted() to be visible to other threads before we execute unpark().
2822 OrderAccess::fence();
2823 ParkEvent * const slp = thread->_SleepEvent ;
2824 if (slp != NULL) slp->unpark() ;
2825 }
2826
2827 // For JSR166. Unpark even if interrupt status already was set
2828 if (thread->is_Java_thread())
2829 ((JavaThread*)thread)->parker()->unpark();
2830
2831 ParkEvent * ev = thread->_ParkEvent ;
2832 if (ev != NULL) ev->unpark() ;
2833
2834 }
2835
2836 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
2837 assert(Thread::current() == thread || Threads_lock->owned_by_self(),
2838 "possibility of dangling Thread pointer");
2839
2840 OSThread* osthread = thread->osthread();
2841
2842 bool interrupted = osthread->interrupted();
2843
2844 if (interrupted && clear_interrupted) {
2845 osthread->set_interrupted(false);
2846 // consider thread->_SleepEvent->reset() ... optional optimization
2847 }
2848
2849 return interrupted;
2850 }
2851
2852 ///////////////////////////////////////////////////////////////////////////////////
2853 // signal handling (except suspend/resume)
2854
2855 // This routine may be used by user applications as a "hook" to catch signals.
2856 // The user-defined signal handler must pass unrecognized signals to this
2857 // routine, and if it returns true (non-zero), then the signal handler must
2858 // return immediately. If the flag "abort_if_unrecognized" is true, then this
2859 // routine will never retun false (zero), but instead will execute a VM panic
2860 // routine kill the process.
2861 //
2862 // If this routine returns false, it is OK to call it again. This allows
2863 // the user-defined signal handler to perform checks either before or after
2864 // the VM performs its own checks. Naturally, the user code would be making
2865 // a serious error if it tried to handle an exception (such as a null check
2866 // or breakpoint) that the VM was generating for its own correct operation.
2867 //
2868 // This routine may recognize any of the following kinds of signals:
2869 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1.
2870 // It should be consulted by handlers for any of those signals.
2871 //
2872 // The caller of this routine must pass in the three arguments supplied
2873 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
2874 // field of the structure passed to sigaction(). This routine assumes that
2875 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
2876 //
2877 // Note that the VM will print warnings if it detects conflicting signal
2878 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
2879 //
2880 extern "C" JNIEXPORT int
2881 JVM_handle_bsd_signal(int signo, siginfo_t* siginfo,
2882 void* ucontext, int abort_if_unrecognized);
2883
2884 void signalHandler(int sig, siginfo_t* info, void* uc) {
2885 assert(info != NULL && uc != NULL, "it must be old kernel");
2886 JVM_handle_bsd_signal(sig, info, uc, true);
2887 }
2888
2889
2890 // This boolean allows users to forward their own non-matching signals
2891 // to JVM_handle_bsd_signal, harmlessly.
2892 bool os::Bsd::signal_handlers_are_installed = false;
2893
2894 // For signal-chaining
2895 struct sigaction os::Bsd::sigact[MAXSIGNUM];
2896 unsigned int os::Bsd::sigs = 0;
2897 bool os::Bsd::libjsig_is_loaded = false;
2898 typedef struct sigaction *(*get_signal_t)(int);
2899 get_signal_t os::Bsd::get_signal_action = NULL;
2900
2901 struct sigaction* os::Bsd::get_chained_signal_action(int sig) {
2902 struct sigaction *actp = NULL;
2903
2904 if (libjsig_is_loaded) {
2905 // Retrieve the old signal handler from libjsig
2906 actp = (*get_signal_action)(sig);
2907 }
2908 if (actp == NULL) {
2909 // Retrieve the preinstalled signal handler from jvm
2910 actp = get_preinstalled_handler(sig);
2911 }
2912
2913 return actp;
2914 }
2915
2916 static bool call_chained_handler(struct sigaction *actp, int sig,
2917 siginfo_t *siginfo, void *context) {
2918 // Call the old signal handler
2919 if (actp->sa_handler == SIG_DFL) {
2920 // It's more reasonable to let jvm treat it as an unexpected exception
2921 // instead of taking the default action.
2922 return false;
2923 } else if (actp->sa_handler != SIG_IGN) {
2924 if ((actp->sa_flags & SA_NODEFER) == 0) {
2925 // automaticlly block the signal
2926 sigaddset(&(actp->sa_mask), sig);
2927 }
2928
2929 sa_handler_t hand;
2930 sa_sigaction_t sa;
2931 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
2932 // retrieve the chained handler
2933 if (siginfo_flag_set) {
2934 sa = actp->sa_sigaction;
2935 } else {
2936 hand = actp->sa_handler;
2937 }
2938
2939 if ((actp->sa_flags & SA_RESETHAND) != 0) {
2940 actp->sa_handler = SIG_DFL;
2941 }
2942
2943 // try to honor the signal mask
2944 sigset_t oset;
2945 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
2946
2947 // call into the chained handler
2948 if (siginfo_flag_set) {
2949 (*sa)(sig, siginfo, context);
2950 } else {
2951 (*hand)(sig);
2952 }
2953
2954 // restore the signal mask
2955 pthread_sigmask(SIG_SETMASK, &oset, 0);
2956 }
2957 // Tell jvm's signal handler the signal is taken care of.
2958 return true;
2959 }
2960
2961 bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) {
2962 bool chained = false;
2963 // signal-chaining
2964 if (UseSignalChaining) {
2965 struct sigaction *actp = get_chained_signal_action(sig);
2966 if (actp != NULL) {
2967 chained = call_chained_handler(actp, sig, siginfo, context);
2968 }
2969 }
2970 return chained;
2971 }
2972
2973 struct sigaction* os::Bsd::get_preinstalled_handler(int sig) {
2974 if ((( (unsigned int)1 << sig ) & sigs) != 0) {
2975 return &sigact[sig];
2976 }
2977 return NULL;
2978 }
2979
2980 void os::Bsd::save_preinstalled_handler(int sig, struct sigaction& oldAct) {
2981 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
2982 sigact[sig] = oldAct;
2983 sigs |= (unsigned int)1 << sig;
2984 }
2985
2986 // for diagnostic
2987 int os::Bsd::sigflags[MAXSIGNUM];
2988
2989 int os::Bsd::get_our_sigflags(int sig) {
2990 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
2991 return sigflags[sig];
2992 }
2993
2994 void os::Bsd::set_our_sigflags(int sig, int flags) {
2995 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
2996 sigflags[sig] = flags;
2997 }
2998
2999 void os::Bsd::set_signal_handler(int sig, bool set_installed) {
3000 // Check for overwrite.
3001 struct sigaction oldAct;
3002 sigaction(sig, (struct sigaction*)NULL, &oldAct);
3003
3004 void* oldhand = oldAct.sa_sigaction
3005 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3006 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3007 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
3008 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
3009 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) {
3010 if (AllowUserSignalHandlers || !set_installed) {
3011 // Do not overwrite; user takes responsibility to forward to us.
3012 return;
3013 } else if (UseSignalChaining) {
3014 // save the old handler in jvm
3015 save_preinstalled_handler(sig, oldAct);
3016 // libjsig also interposes the sigaction() call below and saves the
3017 // old sigaction on it own.
3018 } else {
3019 fatal(err_msg("Encountered unexpected pre-existing sigaction handler "
3020 "%#lx for signal %d.", (long)oldhand, sig));
3021 }
3022 }
3023
3024 struct sigaction sigAct;
3025 sigfillset(&(sigAct.sa_mask));
3026 sigAct.sa_handler = SIG_DFL;
3027 if (!set_installed) {
3028 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
3029 } else {
3030 sigAct.sa_sigaction = signalHandler;
3031 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
3032 }
3033 // Save flags, which are set by ours
3034 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
3035 sigflags[sig] = sigAct.sa_flags;
3036
3037 int ret = sigaction(sig, &sigAct, &oldAct);
3038 assert(ret == 0, "check");
3039
3040 void* oldhand2 = oldAct.sa_sigaction
3041 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3042 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3043 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
3044 }
3045
3046 // install signal handlers for signals that HotSpot needs to
3047 // handle in order to support Java-level exception handling.
3048
3049 void os::Bsd::install_signal_handlers() {
3050 if (!signal_handlers_are_installed) {
3051 signal_handlers_are_installed = true;
3052
3053 // signal-chaining
3054 typedef void (*signal_setting_t)();
3055 signal_setting_t begin_signal_setting = NULL;
3056 signal_setting_t end_signal_setting = NULL;
3057 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3058 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
3059 if (begin_signal_setting != NULL) {
3060 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3061 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
3062 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
3063 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
3064 libjsig_is_loaded = true;
3065 assert(UseSignalChaining, "should enable signal-chaining");
3066 }
3067 if (libjsig_is_loaded) {
3068 // Tell libjsig jvm is setting signal handlers
3069 (*begin_signal_setting)();
3070 }
3071
3072 set_signal_handler(SIGSEGV, true);
3073 set_signal_handler(SIGPIPE, true);
3074 set_signal_handler(SIGBUS, true);
3075 set_signal_handler(SIGILL, true);
3076 set_signal_handler(SIGFPE, true);
3077 set_signal_handler(SIGXFSZ, true);
3078
3079 #if defined(__APPLE__)
3080 // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including
3081 // signals caught and handled by the JVM. To work around this, we reset the mach task
3082 // signal handler that's placed on our process by CrashReporter. This disables
3083 // CrashReporter-based reporting.
3084 //
3085 // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes
3086 // on caught fatal signals.
3087 //
3088 // Additionally, gdb installs both standard BSD signal handlers, and mach exception
3089 // handlers. By replacing the existing task exception handler, we disable gdb's mach
3090 // exception handling, while leaving the standard BSD signal handlers functional.
3091 kern_return_t kr;
3092 kr = task_set_exception_ports(mach_task_self(),
3093 EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC,
3094 MACH_PORT_NULL,
3095 EXCEPTION_STATE_IDENTITY,
3096 MACHINE_THREAD_STATE);
3097
3098 assert(kr == KERN_SUCCESS, "could not set mach task signal handler");
3099 #endif
3100
3101 if (libjsig_is_loaded) {
3102 // Tell libjsig jvm finishes setting signal handlers
3103 (*end_signal_setting)();
3104 }
3105
3106 // We don't activate signal checker if libjsig is in place, we trust ourselves
3107 // and if UserSignalHandler is installed all bets are off
3108 if (CheckJNICalls) {
3109 if (libjsig_is_loaded) {
3110 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
3111 check_signals = false;
3112 }
3113 if (AllowUserSignalHandlers) {
3114 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
3115 check_signals = false;
3116 }
3117 }
3118 }
3119 }
3120
3121
3122 /////
3123 // glibc on Bsd platform uses non-documented flag
3124 // to indicate, that some special sort of signal
3125 // trampoline is used.
3126 // We will never set this flag, and we should
3127 // ignore this flag in our diagnostic
3128 #ifdef SIGNIFICANT_SIGNAL_MASK
3129 #undef SIGNIFICANT_SIGNAL_MASK
3130 #endif
3131 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000)
3132
3133 static const char* get_signal_handler_name(address handler,
3134 char* buf, int buflen) {
3135 int offset;
3136 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
3137 if (found) {
3138 // skip directory names
3139 const char *p1, *p2;
3140 p1 = buf;
3141 size_t len = strlen(os::file_separator());
3142 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
3143 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset);
3144 } else {
3145 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
3146 }
3147 return buf;
3148 }
3149
3150 static void print_signal_handler(outputStream* st, int sig,
3151 char* buf, size_t buflen) {
3152 struct sigaction sa;
3153
3154 sigaction(sig, NULL, &sa);
3155
3156 // See comment for SIGNIFICANT_SIGNAL_MASK define
3157 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK;
3158
3159 st->print("%s: ", os::exception_name(sig, buf, buflen));
3160
3161 address handler = (sa.sa_flags & SA_SIGINFO)
3162 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
3163 : CAST_FROM_FN_PTR(address, sa.sa_handler);
3164
3165 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
3166 st->print("SIG_DFL");
3167 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
3168 st->print("SIG_IGN");
3169 } else {
3170 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
3171 }
3172
3173 st->print(", sa_mask[0]=" PTR32_FORMAT, *(uint32_t*)&sa.sa_mask);
3174
3175 address rh = VMError::get_resetted_sighandler(sig);
3176 // May be, handler was resetted by VMError?
3177 if(rh != NULL) {
3178 handler = rh;
3179 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK;
3180 }
3181
3182 st->print(", sa_flags=" PTR32_FORMAT, sa.sa_flags);
3183
3184 // Check: is it our handler?
3185 if(handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) ||
3186 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) {
3187 // It is our signal handler
3188 // check for flags, reset system-used one!
3189 if((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) {
3190 st->print(
3191 ", flags was changed from " PTR32_FORMAT ", consider using jsig library",
3192 os::Bsd::get_our_sigflags(sig));
3193 }
3194 }
3195 st->cr();
3196 }
3197
3198
3199 #define DO_SIGNAL_CHECK(sig) \
3200 if (!sigismember(&check_signal_done, sig)) \
3201 os::Bsd::check_signal_handler(sig)
3202
3203 // This method is a periodic task to check for misbehaving JNI applications
3204 // under CheckJNI, we can add any periodic checks here
3205
3206 void os::run_periodic_checks() {
3207
3208 if (check_signals == false) return;
3209
3210 // SEGV and BUS if overridden could potentially prevent
3211 // generation of hs*.log in the event of a crash, debugging
3212 // such a case can be very challenging, so we absolutely
3213 // check the following for a good measure:
3214 DO_SIGNAL_CHECK(SIGSEGV);
3215 DO_SIGNAL_CHECK(SIGILL);
3216 DO_SIGNAL_CHECK(SIGFPE);
3217 DO_SIGNAL_CHECK(SIGBUS);
3218 DO_SIGNAL_CHECK(SIGPIPE);
3219 DO_SIGNAL_CHECK(SIGXFSZ);
3220
3221
3222 // ReduceSignalUsage allows the user to override these handlers
3223 // see comments at the very top and jvm_solaris.h
3224 if (!ReduceSignalUsage) {
3225 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
3226 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
3227 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
3228 DO_SIGNAL_CHECK(BREAK_SIGNAL);
3229 }
3230
3231 DO_SIGNAL_CHECK(SR_signum);
3232 DO_SIGNAL_CHECK(INTERRUPT_SIGNAL);
3233 }
3234
3235 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
3236
3237 static os_sigaction_t os_sigaction = NULL;
3238
3239 void os::Bsd::check_signal_handler(int sig) {
3240 char buf[O_BUFLEN];
3241 address jvmHandler = NULL;
3242
3243
3244 struct sigaction act;
3245 if (os_sigaction == NULL) {
3246 // only trust the default sigaction, in case it has been interposed
3247 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
3248 if (os_sigaction == NULL) return;
3249 }
3250
3251 os_sigaction(sig, (struct sigaction*)NULL, &act);
3252
3253
3254 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK;
3255
3256 address thisHandler = (act.sa_flags & SA_SIGINFO)
3257 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
3258 : CAST_FROM_FN_PTR(address, act.sa_handler) ;
3259
3260
3261 switch(sig) {
3262 case SIGSEGV:
3263 case SIGBUS:
3264 case SIGFPE:
3265 case SIGPIPE:
3266 case SIGILL:
3267 case SIGXFSZ:
3268 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler);
3269 break;
3270
3271 case SHUTDOWN1_SIGNAL:
3272 case SHUTDOWN2_SIGNAL:
3273 case SHUTDOWN3_SIGNAL:
3274 case BREAK_SIGNAL:
3275 jvmHandler = (address)user_handler();
3276 break;
3277
3278 case INTERRUPT_SIGNAL:
3279 jvmHandler = CAST_FROM_FN_PTR(address, SIG_DFL);
3280 break;
3281
3282 default:
3283 if (sig == SR_signum) {
3284 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler);
3285 } else {
3286 return;
3287 }
3288 break;
3289 }
3290
3291 if (thisHandler != jvmHandler) {
3292 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
3293 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
3294 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
3295 // No need to check this sig any longer
3296 sigaddset(&check_signal_done, sig);
3297 } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) {
3298 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
3299 tty->print("expected:" PTR32_FORMAT, os::Bsd::get_our_sigflags(sig));
3300 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags);
3301 // No need to check this sig any longer
3302 sigaddset(&check_signal_done, sig);
3303 }
3304
3305 // Dump all the signal
3306 if (sigismember(&check_signal_done, sig)) {
3307 print_signal_handlers(tty, buf, O_BUFLEN);
3308 }
3309 }
3310
3311 extern void report_error(char* file_name, int line_no, char* title, char* format, ...);
3312
3313 extern bool signal_name(int signo, char* buf, size_t len);
3314
3315 const char* os::exception_name(int exception_code, char* buf, size_t size) {
3316 if (0 < exception_code && exception_code <= SIGRTMAX) {
3317 // signal
3318 if (!signal_name(exception_code, buf, size)) {
3319 jio_snprintf(buf, size, "SIG%d", exception_code);
3320 }
3321 return buf;
3322 } else {
3323 return NULL;
3324 }
3325 }
3326
3327 // this is called _before_ the most of global arguments have been parsed
3328 void os::init(void) {
3329 char dummy; /* used to get a guess on initial stack address */
3330 // first_hrtime = gethrtime();
3331
3332 // With BsdThreads the JavaMain thread pid (primordial thread)
3333 // is different than the pid of the java launcher thread.
3334 // So, on Bsd, the launcher thread pid is passed to the VM
3335 // via the sun.java.launcher.pid property.
3336 // Use this property instead of getpid() if it was correctly passed.
3337 // See bug 6351349.
3338 pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid();
3339
3340 _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid();
3341
3342 clock_tics_per_sec = CLK_TCK;
3343
3344 init_random(1234567);
3345
3346 ThreadCritical::initialize();
3347
3348 Bsd::set_page_size(getpagesize());
3349 if (Bsd::page_size() == -1) {
3350 fatal(err_msg("os_bsd.cpp: os::init: sysconf failed (%s)",
3351 strerror(errno)));
3352 }
3353 init_page_sizes((size_t) Bsd::page_size());
3354
3355 Bsd::initialize_system_info();
3356
3357 // main_thread points to the aboriginal thread
3358 Bsd::_main_thread = pthread_self();
3359
3360 Bsd::clock_init();
3361 initial_time_count = os::elapsed_counter();
3362
3363 #ifdef __APPLE__
3364 // XXXDARWIN
3365 // Work around the unaligned VM callbacks in hotspot's
3366 // sharedRuntime. The callbacks don't use SSE2 instructions, and work on
3367 // Linux, Solaris, and FreeBSD. On Mac OS X, dyld (rightly so) enforces
3368 // alignment when doing symbol lookup. To work around this, we force early
3369 // binding of all symbols now, thus binding when alignment is known-good.
3370 _dyld_bind_fully_image_containing_address((const void *) &os::init);
3371 #endif
3372 }
3373
3374 // To install functions for atexit system call
3375 extern "C" {
3376 static void perfMemory_exit_helper() {
3377 perfMemory_exit();
3378 }
3379 }
3380
3381 // this is called _after_ the global arguments have been parsed
3382 jint os::init_2(void)
3383 {
3384 // Allocate a single page and mark it as readable for safepoint polling
3385 address polling_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
3386 guarantee( polling_page != MAP_FAILED, "os::init_2: failed to allocate polling page" );
3387
3388 os::set_polling_page( polling_page );
3389
3390 #ifndef PRODUCT
3391 if(Verbose && PrintMiscellaneous)
3392 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page);
3393 #endif
3394
3395 if (!UseMembar) {
3396 address mem_serialize_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
3397 guarantee( mem_serialize_page != NULL, "mmap Failed for memory serialize page");
3398 os::set_memory_serialize_page( mem_serialize_page );
3399
3400 #ifndef PRODUCT
3401 if(Verbose && PrintMiscellaneous)
3402 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
3403 #endif
3404 }
3405
3406 os::large_page_init();
3407
3408 // initialize suspend/resume support - must do this before signal_sets_init()
3409 if (SR_initialize() != 0) {
3410 perror("SR_initialize failed");
3411 return JNI_ERR;
3412 }
3413
3414 Bsd::signal_sets_init();
3415 Bsd::install_signal_handlers();
3416
3417 // Check minimum allowable stack size for thread creation and to initialize
3418 // the java system classes, including StackOverflowError - depends on page
3419 // size. Add a page for compiler2 recursion in main thread.
3420 // Add in 2*BytesPerWord times page size to account for VM stack during
3421 // class initialization depending on 32 or 64 bit VM.
3422 os::Bsd::min_stack_allowed = MAX2(os::Bsd::min_stack_allowed,
3423 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
3424 2*BytesPerWord COMPILER2_PRESENT(+1)) * Bsd::page_size());
3425
3426 size_t threadStackSizeInBytes = ThreadStackSize * K;
3427 if (threadStackSizeInBytes != 0 &&
3428 threadStackSizeInBytes < os::Bsd::min_stack_allowed) {
3429 tty->print_cr("\nThe stack size specified is too small, "
3430 "Specify at least %dk",
3431 os::Bsd::min_stack_allowed/ K);
3432 return JNI_ERR;
3433 }
3434
3435 // Make the stack size a multiple of the page size so that
3436 // the yellow/red zones can be guarded.
3437 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes,
3438 vm_page_size()));
3439
3440 if (MaxFDLimit) {
3441 // set the number of file descriptors to max. print out error
3442 // if getrlimit/setrlimit fails but continue regardless.
3443 struct rlimit nbr_files;
3444 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
3445 if (status != 0) {
3446 if (PrintMiscellaneous && (Verbose || WizardMode))
3447 perror("os::init_2 getrlimit failed");
3448 } else {
3449 nbr_files.rlim_cur = nbr_files.rlim_max;
3450
3451 #ifdef __APPLE__
3452 // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if
3453 // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must
3454 // be used instead
3455 nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur);
3456 #endif
3457
3458 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
3459 if (status != 0) {
3460 if (PrintMiscellaneous && (Verbose || WizardMode))
3461 perror("os::init_2 setrlimit failed");
3462 }
3463 }
3464 }
3465
3466 // at-exit methods are called in the reverse order of their registration.
3467 // atexit functions are called on return from main or as a result of a
3468 // call to exit(3C). There can be only 32 of these functions registered
3469 // and atexit() does not set errno.
3470
3471 if (PerfAllowAtExitRegistration) {
3472 // only register atexit functions if PerfAllowAtExitRegistration is set.
3473 // atexit functions can be delayed until process exit time, which
3474 // can be problematic for embedded VM situations. Embedded VMs should
3475 // call DestroyJavaVM() to assure that VM resources are released.
3476
3477 // note: perfMemory_exit_helper atexit function may be removed in
3478 // the future if the appropriate cleanup code can be added to the
3479 // VM_Exit VMOperation's doit method.
3480 if (atexit(perfMemory_exit_helper) != 0) {
3481 warning("os::init2 atexit(perfMemory_exit_helper) failed");
3482 }
3483 }
3484
3485 // initialize thread priority policy
3486 prio_init();
3487
3488 #ifdef __APPLE__
3489 // dynamically link to objective c gc registration
3490 void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY);
3491 if (handleLibObjc != NULL) {
3492 objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER);
3493 }
3494 #endif
3495
3496 return JNI_OK;
3497 }
3498
3499 // this is called at the end of vm_initialization
3500 void os::init_3(void) { }
3501
3502 // Mark the polling page as unreadable
3503 void os::make_polling_page_unreadable(void) {
3504 if( !guard_memory((char*)_polling_page, Bsd::page_size()) )
3505 fatal("Could not disable polling page");
3506 };
3507
3508 // Mark the polling page as readable
3509 void os::make_polling_page_readable(void) {
3510 if( !bsd_mprotect((char *)_polling_page, Bsd::page_size(), PROT_READ)) {
3511 fatal("Could not enable polling page");
3512 }
3513 };
3514
3515 int os::active_processor_count() {
3516 return _processor_count;
3517 }
3518
3519 void os::set_native_thread_name(const char *name) {
3520 #if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5
3521 // This is only supported in Snow Leopard and beyond
3522 if (name != NULL) {
3523 // Add a "Java: " prefix to the name
3524 char buf[MAXTHREADNAMESIZE];
3525 snprintf(buf, sizeof(buf), "Java: %s", name);
3526 pthread_setname_np(buf);
3527 }
3528 #endif
3529 }
3530
3531 bool os::distribute_processes(uint length, uint* distribution) {
3532 // Not yet implemented.
3533 return false;
3534 }
3535
3536 bool os::bind_to_processor(uint processor_id) {
3537 // Not yet implemented.
3538 return false;
3539 }
3540
3541 ///
3542
3543 // Suspends the target using the signal mechanism and then grabs the PC before
3544 // resuming the target. Used by the flat-profiler only
3545 ExtendedPC os::get_thread_pc(Thread* thread) {
3546 // Make sure that it is called by the watcher for the VMThread
3547 assert(Thread::current()->is_Watcher_thread(), "Must be watcher");
3548 assert(thread->is_VM_thread(), "Can only be called for VMThread");
3549
3550 ExtendedPC epc;
3551
3552 OSThread* osthread = thread->osthread();
3553 if (do_suspend(osthread)) {
3554 if (osthread->ucontext() != NULL) {
3555 epc = os::Bsd::ucontext_get_pc(osthread->ucontext());
3556 } else {
3557 // NULL context is unexpected, double-check this is the VMThread
3558 guarantee(thread->is_VM_thread(), "can only be called for VMThread");
3559 }
3560 do_resume(osthread);
3561 }
3562 // failure means pthread_kill failed for some reason - arguably this is
3563 // a fatal problem, but such problems are ignored elsewhere
3564
3565 return epc;
3566 }
3567
3568 int os::Bsd::safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime)
3569 {
3570 return pthread_cond_timedwait(_cond, _mutex, _abstime);
3571 }
3572
3573 ////////////////////////////////////////////////////////////////////////////////
3574 // debug support
3575
3576 bool os::find(address addr, outputStream* st) {
3577 Dl_info dlinfo;
3578 memset(&dlinfo, 0, sizeof(dlinfo));
3579 if (dladdr(addr, &dlinfo)) {
3580 st->print(PTR_FORMAT ": ", addr);
3581 if (dlinfo.dli_sname != NULL) {
3582 st->print("%s+%#x", dlinfo.dli_sname,
3583 addr - (intptr_t)dlinfo.dli_saddr);
3584 } else if (dlinfo.dli_fname) {
3585 st->print("<offset %#x>", addr - (intptr_t)dlinfo.dli_fbase);
3586 } else {
3587 st->print("<absolute address>");
3588 }
3589 if (dlinfo.dli_fname) {
3590 st->print(" in %s", dlinfo.dli_fname);
3591 }
3592 if (dlinfo.dli_fbase) {
3593 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase);
3594 }
3595 st->cr();
3596
3597 if (Verbose) {
3598 // decode some bytes around the PC
3599 address begin = clamp_address_in_page(addr-40, addr);
3600 address end = clamp_address_in_page(addr+40, addr);
3601 address lowest = (address) dlinfo.dli_sname;
3602 if (!lowest) lowest = (address) dlinfo.dli_fbase;
3603 if (begin < lowest) begin = lowest;
3604 Dl_info dlinfo2;
3605 if (dladdr(end, &dlinfo2) && dlinfo2.dli_saddr != dlinfo.dli_saddr
3606 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin)
3607 end = (address) dlinfo2.dli_saddr;
3608 Disassembler::decode(begin, end, st);
3609 }
3610 return true;
3611 }
3612 return false;
3613 }
3614
3615 ////////////////////////////////////////////////////////////////////////////////
3616 // misc
3617
3618 // This does not do anything on Bsd. This is basically a hook for being
3619 // able to use structured exception handling (thread-local exception filters)
3620 // on, e.g., Win32.
3621 void
3622 os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method,
3623 JavaCallArguments* args, Thread* thread) {
3624 f(value, method, args, thread);
3625 }
3626
3627 void os::print_statistics() {
3628 }
3629
3630 int os::message_box(const char* title, const char* message) {
3631 int i;
3632 fdStream err(defaultStream::error_fd());
3633 for (i = 0; i < 78; i++) err.print_raw("=");
3634 err.cr();
3635 err.print_raw_cr(title);
3636 for (i = 0; i < 78; i++) err.print_raw("-");
3637 err.cr();
3638 err.print_raw_cr(message);
3639 for (i = 0; i < 78; i++) err.print_raw("=");
3640 err.cr();
3641
3642 char buf[16];
3643 // Prevent process from exiting upon "read error" without consuming all CPU
3644 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3645
3646 return buf[0] == 'y' || buf[0] == 'Y';
3647 }
3648
3649 int os::stat(const char *path, struct stat *sbuf) {
3650 char pathbuf[MAX_PATH];
3651 if (strlen(path) > MAX_PATH - 1) {
3652 errno = ENAMETOOLONG;
3653 return -1;
3654 }
3655 os::native_path(strcpy(pathbuf, path));
3656 return ::stat(pathbuf, sbuf);
3657 }
3658
3659 bool os::check_heap(bool force) {
3660 return true;
3661 }
3662
3663 int local_vsnprintf(char* buf, size_t count, const char* format, va_list args) {
3664 return ::vsnprintf(buf, count, format, args);
3665 }
3666
3667 // Is a (classpath) directory empty?
3668 bool os::dir_is_empty(const char* path) {
3669 DIR *dir = NULL;
3670 struct dirent *ptr;
3671
3672 dir = opendir(path);
3673 if (dir == NULL) return true;
3674
3675 /* Scan the directory */
3676 bool result = true;
3677 char buf[sizeof(struct dirent) + MAX_PATH];
3678 while (result && (ptr = ::readdir(dir)) != NULL) {
3679 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
3680 result = false;
3681 }
3682 }
3683 closedir(dir);
3684 return result;
3685 }
3686
3687 // This code originates from JDK's sysOpen and open64_w
3688 // from src/solaris/hpi/src/system_md.c
3689
3690 #ifndef O_DELETE
3691 #define O_DELETE 0x10000
3692 #endif
3693
3694 // Open a file. Unlink the file immediately after open returns
3695 // if the specified oflag has the O_DELETE flag set.
3696 // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c
3697
3698 int os::open(const char *path, int oflag, int mode) {
3699
3700 if (strlen(path) > MAX_PATH - 1) {
3701 errno = ENAMETOOLONG;
3702 return -1;
3703 }
3704 int fd;
3705 int o_delete = (oflag & O_DELETE);
3706 oflag = oflag & ~O_DELETE;
3707
3708 fd = ::open(path, oflag, mode);
3709 if (fd == -1) return -1;
3710
3711 //If the open succeeded, the file might still be a directory
3712 {
3713 struct stat buf;
3714 int ret = ::fstat(fd, &buf);
3715 int st_mode = buf.st_mode;
3716
3717 if (ret != -1) {
3718 if ((st_mode & S_IFMT) == S_IFDIR) {
3719 errno = EISDIR;
3720 ::close(fd);
3721 return -1;
3722 }
3723 } else {
3724 ::close(fd);
3725 return -1;
3726 }
3727 }
3728
3729 /*
3730 * All file descriptors that are opened in the JVM and not
3731 * specifically destined for a subprocess should have the
3732 * close-on-exec flag set. If we don't set it, then careless 3rd
3733 * party native code might fork and exec without closing all
3734 * appropriate file descriptors (e.g. as we do in closeDescriptors in
3735 * UNIXProcess.c), and this in turn might:
3736 *
3737 * - cause end-of-file to fail to be detected on some file
3738 * descriptors, resulting in mysterious hangs, or
3739 *
3740 * - might cause an fopen in the subprocess to fail on a system
3741 * suffering from bug 1085341.
3742 *
3743 * (Yes, the default setting of the close-on-exec flag is a Unix
3744 * design flaw)
3745 *
3746 * See:
3747 * 1085341: 32-bit stdio routines should support file descriptors >255
3748 * 4843136: (process) pipe file descriptor from Runtime.exec not being closed
3749 * 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
3750 */
3751 #ifdef FD_CLOEXEC
3752 {
3753 int flags = ::fcntl(fd, F_GETFD);
3754 if (flags != -1)
3755 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
3756 }
3757 #endif
3758
3759 if (o_delete != 0) {
3760 ::unlink(path);
3761 }
3762 return fd;
3763 }
3764
3765
3766 // create binary file, rewriting existing file if required
3767 int os::create_binary_file(const char* path, bool rewrite_existing) {
3768 int oflags = O_WRONLY | O_CREAT;
3769 if (!rewrite_existing) {
3770 oflags |= O_EXCL;
3771 }
3772 return ::open(path, oflags, S_IREAD | S_IWRITE);
3773 }
3774
3775 // return current position of file pointer
3776 jlong os::current_file_offset(int fd) {
3777 return (jlong)::lseek(fd, (off_t)0, SEEK_CUR);
3778 }
3779
3780 // move file pointer to the specified offset
3781 jlong os::seek_to_file_offset(int fd, jlong offset) {
3782 return (jlong)::lseek(fd, (off_t)offset, SEEK_SET);
3783 }
3784
3785 // This code originates from JDK's sysAvailable
3786 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c
3787
3788 int os::available(int fd, jlong *bytes) {
3789 jlong cur, end;
3790 int mode;
3791 struct stat buf;
3792
3793 if (::fstat(fd, &buf) >= 0) {
3794 mode = buf.st_mode;
3795 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
3796 /*
3797 * XXX: is the following call interruptible? If so, this might
3798 * need to go through the INTERRUPT_IO() wrapper as for other
3799 * blocking, interruptible calls in this file.
3800 */
3801 int n;
3802 if (::ioctl(fd, FIONREAD, &n) >= 0) {
3803 *bytes = n;
3804 return 1;
3805 }
3806 }
3807 }
3808 if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) {
3809 return 0;
3810 } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) {
3811 return 0;
3812 } else if (::lseek(fd, cur, SEEK_SET) == -1) {
3813 return 0;
3814 }
3815 *bytes = end - cur;
3816 return 1;
3817 }
3818
3819 int os::socket_available(int fd, jint *pbytes) {
3820 if (fd < 0)
3821 return OS_OK;
3822
3823 int ret;
3824
3825 RESTARTABLE(::ioctl(fd, FIONREAD, pbytes), ret);
3826
3827 //%% note ioctl can return 0 when successful, JVM_SocketAvailable
3828 // is expected to return 0 on failure and 1 on success to the jdk.
3829
3830 return (ret == OS_ERR) ? 0 : 1;
3831 }
3832
3833 // Map a block of memory.
3834 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
3835 char *addr, size_t bytes, bool read_only,
3836 bool allow_exec) {
3837 int prot;
3838 int flags;
3839
3840 if (read_only) {
3841 prot = PROT_READ;
3842 flags = MAP_SHARED;
3843 } else {
3844 prot = PROT_READ | PROT_WRITE;
3845 flags = MAP_PRIVATE;
3846 }
3847
3848 if (allow_exec) {
3849 prot |= PROT_EXEC;
3850 }
3851
3852 if (addr != NULL) {
3853 flags |= MAP_FIXED;
3854 }
3855
3856 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
3857 fd, file_offset);
3858 if (mapped_address == MAP_FAILED) {
3859 return NULL;
3860 }
3861 return mapped_address;
3862 }
3863
3864
3865 // Remap a block of memory.
3866 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
3867 char *addr, size_t bytes, bool read_only,
3868 bool allow_exec) {
3869 // same as map_memory() on this OS
3870 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
3871 allow_exec);
3872 }
3873
3874
3875 // Unmap a block of memory.
3876 bool os::pd_unmap_memory(char* addr, size_t bytes) {
3877 return munmap(addr, bytes) == 0;
3878 }
3879
3880 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
3881 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
3882 // of a thread.
3883 //
3884 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
3885 // the fast estimate available on the platform.
3886
3887 jlong os::current_thread_cpu_time() {
3888 #ifdef __APPLE__
3889 return os::thread_cpu_time(Thread::current(), true /* user + sys */);
3890 #endif
3891 }
3892
3893 jlong os::thread_cpu_time(Thread* thread) {
3894 }
3895
3896 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
3897 #ifdef __APPLE__
3898 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
3899 #endif
3900 }
3901
3902 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
3903 #ifdef __APPLE__
3904 struct thread_basic_info tinfo;
3905 mach_msg_type_number_t tcount = THREAD_INFO_MAX;
3906 kern_return_t kr;
3907 thread_t mach_thread;
3908
3909 mach_thread = thread->osthread()->thread_id();
3910 kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount);
3911 if (kr != KERN_SUCCESS)
3912 return -1;
3913
3914 if (user_sys_cpu_time) {
3915 jlong nanos;
3916 nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000;
3917 nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000;
3918 return nanos;
3919 } else {
3920 return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000);
3921 }
3922 #endif
3923 }
3924
3925
3926 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3927 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
3928 info_ptr->may_skip_backward = false; // elapsed time not wall time
3929 info_ptr->may_skip_forward = false; // elapsed time not wall time
3930 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3931 }
3932
3933 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3934 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
3935 info_ptr->may_skip_backward = false; // elapsed time not wall time
3936 info_ptr->may_skip_forward = false; // elapsed time not wall time
3937 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3938 }
3939
3940 bool os::is_thread_cpu_time_supported() {
3941 #ifdef __APPLE__
3942 return true;
3943 #else
3944 return false;
3945 #endif
3946 }
3947
3948 // System loadavg support. Returns -1 if load average cannot be obtained.
3949 // Bsd doesn't yet have a (official) notion of processor sets,
3950 // so just return the system wide load average.
3951 int os::loadavg(double loadavg[], int nelem) {
3952 return ::getloadavg(loadavg, nelem);
3953 }
3954
3955 void os::pause() {
3956 char filename[MAX_PATH];
3957 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
3958 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
3959 } else {
3960 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
3961 }
3962
3963 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
3964 if (fd != -1) {
3965 struct stat buf;
3966 ::close(fd);
3967 while (::stat(filename, &buf) == 0) {
3968 (void)::poll(NULL, 0, 100);
3969 }
3970 } else {
3971 jio_fprintf(stderr,
3972 "Could not open pause file '%s', continuing immediately.\n", filename);
3973 }
3974 }
3975
3976
3977 // Refer to the comments in os_solaris.cpp park-unpark.
3978 //
3979 // Beware -- Some versions of NPTL embody a flaw where pthread_cond_timedwait() can
3980 // hang indefinitely. For instance NPTL 0.60 on 2.4.21-4ELsmp is vulnerable.
3981 // For specifics regarding the bug see GLIBC BUGID 261237 :
3982 // http://www.mail-archive.com/debian-glibc@lists.debian.org/msg10837.html.
3983 // Briefly, pthread_cond_timedwait() calls with an expiry time that's not in the future
3984 // will either hang or corrupt the condvar, resulting in subsequent hangs if the condvar
3985 // is used. (The simple C test-case provided in the GLIBC bug report manifests the
3986 // hang). The JVM is vulernable via sleep(), Object.wait(timo), LockSupport.parkNanos()
3987 // and monitorenter when we're using 1-0 locking. All those operations may result in
3988 // calls to pthread_cond_timedwait(). Using LD_ASSUME_KERNEL to use an older version
3989 // of libpthread avoids the problem, but isn't practical.
3990 //
3991 // Possible remedies:
3992 //
3993 // 1. Establish a minimum relative wait time. 50 to 100 msecs seems to work.
3994 // This is palliative and probabilistic, however. If the thread is preempted
3995 // between the call to compute_abstime() and pthread_cond_timedwait(), more
3996 // than the minimum period may have passed, and the abstime may be stale (in the
3997 // past) resultin in a hang. Using this technique reduces the odds of a hang
3998 // but the JVM is still vulnerable, particularly on heavily loaded systems.
3999 //
4000 // 2. Modify park-unpark to use per-thread (per ParkEvent) pipe-pairs instead
4001 // of the usual flag-condvar-mutex idiom. The write side of the pipe is set
4002 // NDELAY. unpark() reduces to write(), park() reduces to read() and park(timo)
4003 // reduces to poll()+read(). This works well, but consumes 2 FDs per extant
4004 // thread.
4005 //
4006 // 3. Embargo pthread_cond_timedwait() and implement a native "chron" thread
4007 // that manages timeouts. We'd emulate pthread_cond_timedwait() by enqueuing
4008 // a timeout request to the chron thread and then blocking via pthread_cond_wait().
4009 // This also works well. In fact it avoids kernel-level scalability impediments
4010 // on certain platforms that don't handle lots of active pthread_cond_timedwait()
4011 // timers in a graceful fashion.
4012 //
4013 // 4. When the abstime value is in the past it appears that control returns
4014 // correctly from pthread_cond_timedwait(), but the condvar is left corrupt.
4015 // Subsequent timedwait/wait calls may hang indefinitely. Given that, we
4016 // can avoid the problem by reinitializing the condvar -- by cond_destroy()
4017 // followed by cond_init() -- after all calls to pthread_cond_timedwait().
4018 // It may be possible to avoid reinitialization by checking the return
4019 // value from pthread_cond_timedwait(). In addition to reinitializing the
4020 // condvar we must establish the invariant that cond_signal() is only called
4021 // within critical sections protected by the adjunct mutex. This prevents
4022 // cond_signal() from "seeing" a condvar that's in the midst of being
4023 // reinitialized or that is corrupt. Sadly, this invariant obviates the
4024 // desirable signal-after-unlock optimization that avoids futile context switching.
4025 //
4026 // I'm also concerned that some versions of NTPL might allocate an auxilliary
4027 // structure when a condvar is used or initialized. cond_destroy() would
4028 // release the helper structure. Our reinitialize-after-timedwait fix
4029 // put excessive stress on malloc/free and locks protecting the c-heap.
4030 //
4031 // We currently use (4). See the WorkAroundNTPLTimedWaitHang flag.
4032 // It may be possible to refine (4) by checking the kernel and NTPL verisons
4033 // and only enabling the work-around for vulnerable environments.
4034
4035 // utility to compute the abstime argument to timedwait:
4036 // millis is the relative timeout time
4037 // abstime will be the absolute timeout time
4038 // TODO: replace compute_abstime() with unpackTime()
4039
4040 static struct timespec* compute_abstime(struct timespec* abstime, jlong millis) {
4041 if (millis < 0) millis = 0;
4042 struct timeval now;
4043 int status = gettimeofday(&now, NULL);
4044 assert(status == 0, "gettimeofday");
4045 jlong seconds = millis / 1000;
4046 millis %= 1000;
4047 if (seconds > 50000000) { // see man cond_timedwait(3T)
4048 seconds = 50000000;
4049 }
4050 abstime->tv_sec = now.tv_sec + seconds;
4051 long usec = now.tv_usec + millis * 1000;
4052 if (usec >= 1000000) {
4053 abstime->tv_sec += 1;
4054 usec -= 1000000;
4055 }
4056 abstime->tv_nsec = usec * 1000;
4057 return abstime;
4058 }
4059
4060
4061 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately.
4062 // Conceptually TryPark() should be equivalent to park(0).
4063
4064 int os::PlatformEvent::TryPark() {
4065 for (;;) {
4066 const int v = _Event ;
4067 guarantee ((v == 0) || (v == 1), "invariant") ;
4068 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ;
4069 }
4070 }
4071
4072 void os::PlatformEvent::park() { // AKA "down()"
4073 // Invariant: Only the thread associated with the Event/PlatformEvent
4074 // may call park().
4075 // TODO: assert that _Assoc != NULL or _Assoc == Self
4076 int v ;
4077 for (;;) {
4078 v = _Event ;
4079 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
4080 }
4081 guarantee (v >= 0, "invariant") ;
4082 if (v == 0) {
4083 // Do this the hard way by blocking ...
4084 int status = pthread_mutex_lock(_mutex);
4085 assert_status(status == 0, status, "mutex_lock");
4086 guarantee (_nParked == 0, "invariant") ;
4087 ++ _nParked ;
4088 while (_Event < 0) {
4089 status = pthread_cond_wait(_cond, _mutex);
4090 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ...
4091 // Treat this the same as if the wait was interrupted
4092 if (status == ETIMEDOUT) { status = EINTR; }
4093 assert_status(status == 0 || status == EINTR, status, "cond_wait");
4094 }
4095 -- _nParked ;
4096
4097 // In theory we could move the ST of 0 into _Event past the unlock(),
4098 // but then we'd need a MEMBAR after the ST.
4099 _Event = 0 ;
4100 status = pthread_mutex_unlock(_mutex);
4101 assert_status(status == 0, status, "mutex_unlock");
4102 }
4103 guarantee (_Event >= 0, "invariant") ;
4104 }
4105
4106 int os::PlatformEvent::park(jlong millis) {
4107 guarantee (_nParked == 0, "invariant") ;
4108
4109 int v ;
4110 for (;;) {
4111 v = _Event ;
4112 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
4113 }
4114 guarantee (v >= 0, "invariant") ;
4115 if (v != 0) return OS_OK ;
4116
4117 // We do this the hard way, by blocking the thread.
4118 // Consider enforcing a minimum timeout value.
4119 struct timespec abst;
4120 compute_abstime(&abst, millis);
4121
4122 int ret = OS_TIMEOUT;
4123 int status = pthread_mutex_lock(_mutex);
4124 assert_status(status == 0, status, "mutex_lock");
4125 guarantee (_nParked == 0, "invariant") ;
4126 ++_nParked ;
4127
4128 // Object.wait(timo) will return because of
4129 // (a) notification
4130 // (b) timeout
4131 // (c) thread.interrupt
4132 //
4133 // Thread.interrupt and object.notify{All} both call Event::set.
4134 // That is, we treat thread.interrupt as a special case of notification.
4135 // The underlying Solaris implementation, cond_timedwait, admits
4136 // spurious/premature wakeups, but the JLS/JVM spec prevents the
4137 // JVM from making those visible to Java code. As such, we must
4138 // filter out spurious wakeups. We assume all ETIME returns are valid.
4139 //
4140 // TODO: properly differentiate simultaneous notify+interrupt.
4141 // In that case, we should propagate the notify to another waiter.
4142
4143 while (_Event < 0) {
4144 status = os::Bsd::safe_cond_timedwait(_cond, _mutex, &abst);
4145 if (status != 0 && WorkAroundNPTLTimedWaitHang) {
4146 pthread_cond_destroy (_cond);
4147 pthread_cond_init (_cond, NULL) ;
4148 }
4149 assert_status(status == 0 || status == EINTR ||
4150 status == ETIMEDOUT,
4151 status, "cond_timedwait");
4152 if (!FilterSpuriousWakeups) break ; // previous semantics
4153 if (status == ETIMEDOUT) break ;
4154 // We consume and ignore EINTR and spurious wakeups.
4155 }
4156 --_nParked ;
4157 if (_Event >= 0) {
4158 ret = OS_OK;
4159 }
4160 _Event = 0 ;
4161 status = pthread_mutex_unlock(_mutex);
4162 assert_status(status == 0, status, "mutex_unlock");
4163 assert (_nParked == 0, "invariant") ;
4164 return ret;
4165 }
4166
4167 void os::PlatformEvent::unpark() {
4168 int v, AnyWaiters ;
4169 for (;;) {
4170 v = _Event ;
4171 if (v > 0) {
4172 // The LD of _Event could have reordered or be satisfied
4173 // by a read-aside from this processor's write buffer.
4174 // To avoid problems execute a barrier and then
4175 // ratify the value.
4176 OrderAccess::fence() ;
4177 if (_Event == v) return ;
4178 continue ;
4179 }
4180 if (Atomic::cmpxchg (v+1, &_Event, v) == v) break ;
4181 }
4182 if (v < 0) {
4183 // Wait for the thread associated with the event to vacate
4184 int status = pthread_mutex_lock(_mutex);
4185 assert_status(status == 0, status, "mutex_lock");
4186 AnyWaiters = _nParked ;
4187 assert (AnyWaiters == 0 || AnyWaiters == 1, "invariant") ;
4188 if (AnyWaiters != 0 && WorkAroundNPTLTimedWaitHang) {
4189 AnyWaiters = 0 ;
4190 pthread_cond_signal (_cond);
4191 }
4192 status = pthread_mutex_unlock(_mutex);
4193 assert_status(status == 0, status, "mutex_unlock");
4194 if (AnyWaiters != 0) {
4195 status = pthread_cond_signal(_cond);
4196 assert_status(status == 0, status, "cond_signal");
4197 }
4198 }
4199
4200 // Note that we signal() _after dropping the lock for "immortal" Events.
4201 // This is safe and avoids a common class of futile wakeups. In rare
4202 // circumstances this can cause a thread to return prematurely from
4203 // cond_{timed}wait() but the spurious wakeup is benign and the victim will
4204 // simply re-test the condition and re-park itself.
4205 }
4206
4207
4208 // JSR166
4209 // -------------------------------------------------------
4210
4211 /*
4212 * The solaris and bsd implementations of park/unpark are fairly
4213 * conservative for now, but can be improved. They currently use a
4214 * mutex/condvar pair, plus a a count.
4215 * Park decrements count if > 0, else does a condvar wait. Unpark
4216 * sets count to 1 and signals condvar. Only one thread ever waits
4217 * on the condvar. Contention seen when trying to park implies that someone
4218 * is unparking you, so don't wait. And spurious returns are fine, so there
4219 * is no need to track notifications.
4220 */
4221
4222 #define MAX_SECS 100000000
4223 /*
4224 * This code is common to bsd and solaris and will be moved to a
4225 * common place in dolphin.
4226 *
4227 * The passed in time value is either a relative time in nanoseconds
4228 * or an absolute time in milliseconds. Either way it has to be unpacked
4229 * into suitable seconds and nanoseconds components and stored in the
4230 * given timespec structure.
4231 * Given time is a 64-bit value and the time_t used in the timespec is only
4232 * a signed-32-bit value (except on 64-bit Bsd) we have to watch for
4233 * overflow if times way in the future are given. Further on Solaris versions
4234 * prior to 10 there is a restriction (see cond_timedwait) that the specified
4235 * number of seconds, in abstime, is less than current_time + 100,000,000.
4236 * As it will be 28 years before "now + 100000000" will overflow we can
4237 * ignore overflow and just impose a hard-limit on seconds using the value
4238 * of "now + 100,000,000". This places a limit on the timeout of about 3.17
4239 * years from "now".
4240 */
4241
4242 static void unpackTime(struct timespec* absTime, bool isAbsolute, jlong time) {
4243 assert (time > 0, "convertTime");
4244
4245 struct timeval now;
4246 int status = gettimeofday(&now, NULL);
4247 assert(status == 0, "gettimeofday");
4248
4249 time_t max_secs = now.tv_sec + MAX_SECS;
4250
4251 if (isAbsolute) {
4252 jlong secs = time / 1000;
4253 if (secs > max_secs) {
4254 absTime->tv_sec = max_secs;
4255 }
4256 else {
4257 absTime->tv_sec = secs;
4258 }
4259 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
4260 }
4261 else {
4262 jlong secs = time / NANOSECS_PER_SEC;
4263 if (secs >= MAX_SECS) {
4264 absTime->tv_sec = max_secs;
4265 absTime->tv_nsec = 0;
4266 }
4267 else {
4268 absTime->tv_sec = now.tv_sec + secs;
4269 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
4270 if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
4271 absTime->tv_nsec -= NANOSECS_PER_SEC;
4272 ++absTime->tv_sec; // note: this must be <= max_secs
4273 }
4274 }
4275 }
4276 assert(absTime->tv_sec >= 0, "tv_sec < 0");
4277 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
4278 assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
4279 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
4280 }
4281
4282 void Parker::park(bool isAbsolute, jlong time) {
4283 // Optional fast-path check:
4284 // Return immediately if a permit is available.
4285 if (_counter > 0) {
4286 _counter = 0 ;
4287 OrderAccess::fence();
4288 return ;
4289 }
4290
4291 Thread* thread = Thread::current();
4292 assert(thread->is_Java_thread(), "Must be JavaThread");
4293 JavaThread *jt = (JavaThread *)thread;
4294
4295 // Optional optimization -- avoid state transitions if there's an interrupt pending.
4296 // Check interrupt before trying to wait
4297 if (Thread::is_interrupted(thread, false)) {
4298 return;
4299 }
4300
4301 // Next, demultiplex/decode time arguments
4302 struct timespec absTime;
4303 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all
4304 return;
4305 }
4306 if (time > 0) {
4307 unpackTime(&absTime, isAbsolute, time);
4308 }
4309
4310
4311 // Enter safepoint region
4312 // Beware of deadlocks such as 6317397.
4313 // The per-thread Parker:: mutex is a classic leaf-lock.
4314 // In particular a thread must never block on the Threads_lock while
4315 // holding the Parker:: mutex. If safepoints are pending both the
4316 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock.
4317 ThreadBlockInVM tbivm(jt);
4318
4319 // Don't wait if cannot get lock since interference arises from
4320 // unblocking. Also. check interrupt before trying wait
4321 if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) {
4322 return;
4323 }
4324
4325 int status ;
4326 if (_counter > 0) { // no wait needed
4327 _counter = 0;
4328 status = pthread_mutex_unlock(_mutex);
4329 assert (status == 0, "invariant") ;
4330 OrderAccess::fence();
4331 return;
4332 }
4333
4334 #ifdef ASSERT
4335 // Don't catch signals while blocked; let the running threads have the signals.
4336 // (This allows a debugger to break into the running thread.)
4337 sigset_t oldsigs;
4338 sigset_t* allowdebug_blocked = os::Bsd::allowdebug_blocked_signals();
4339 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs);
4340 #endif
4341
4342 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
4343 jt->set_suspend_equivalent();
4344 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
4345
4346 if (time == 0) {
4347 status = pthread_cond_wait (_cond, _mutex) ;
4348 } else {
4349 status = os::Bsd::safe_cond_timedwait (_cond, _mutex, &absTime) ;
4350 if (status != 0 && WorkAroundNPTLTimedWaitHang) {
4351 pthread_cond_destroy (_cond) ;
4352 pthread_cond_init (_cond, NULL);
4353 }
4354 }
4355 assert_status(status == 0 || status == EINTR ||
4356 status == ETIMEDOUT,
4357 status, "cond_timedwait");
4358
4359 #ifdef ASSERT
4360 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL);
4361 #endif
4362
4363 _counter = 0 ;
4364 status = pthread_mutex_unlock(_mutex) ;
4365 assert_status(status == 0, status, "invariant") ;
4366 // If externally suspended while waiting, re-suspend
4367 if (jt->handle_special_suspend_equivalent_condition()) {
4368 jt->java_suspend_self();
4369 }
4370
4371 OrderAccess::fence();
4372 }
4373
4374 void Parker::unpark() {
4375 int s, status ;
4376 status = pthread_mutex_lock(_mutex);
4377 assert (status == 0, "invariant") ;
4378 s = _counter;
4379 _counter = 1;
4380 if (s < 1) {
4381 if (WorkAroundNPTLTimedWaitHang) {
4382 status = pthread_cond_signal (_cond) ;
4383 assert (status == 0, "invariant") ;
4384 status = pthread_mutex_unlock(_mutex);
4385 assert (status == 0, "invariant") ;
4386 } else {
4387 status = pthread_mutex_unlock(_mutex);
4388 assert (status == 0, "invariant") ;
4389 status = pthread_cond_signal (_cond) ;
4390 assert (status == 0, "invariant") ;
4391 }
4392 } else {
4393 pthread_mutex_unlock(_mutex);
4394 assert (status == 0, "invariant") ;
4395 }
4396 }
4397
4398
4399 /* Darwin has no "environ" in a dynamic library. */
4400 #ifdef __APPLE__
4401 #include <crt_externs.h>
4402 #define environ (*_NSGetEnviron())
4403 #else
4404 extern char** environ;
4405 #endif
4406
4407 // Run the specified command in a separate process. Return its exit value,
4408 // or -1 on failure (e.g. can't fork a new process).
4409 // Unlike system(), this function can be called from signal handler. It
4410 // doesn't block SIGINT et al.
4411 int os::fork_and_exec(char* cmd) {
4412 const char * argv[4] = {"sh", "-c", cmd, NULL};
4413
4414 // fork() in BsdThreads/NPTL is not async-safe. It needs to run
4415 // pthread_atfork handlers and reset pthread library. All we need is a
4416 // separate process to execve. Make a direct syscall to fork process.
4417 // On IA64 there's no fork syscall, we have to use fork() and hope for
4418 // the best...
4419 pid_t pid = fork();
4420
4421 if (pid < 0) {
4422 // fork failed
4423 return -1;
4424
4425 } else if (pid == 0) {
4426 // child process
4427
4428 // execve() in BsdThreads will call pthread_kill_other_threads_np()
4429 // first to kill every thread on the thread list. Because this list is
4430 // not reset by fork() (see notes above), execve() will instead kill
4431 // every thread in the parent process. We know this is the only thread
4432 // in the new process, so make a system call directly.
4433 // IA64 should use normal execve() from glibc to match the glibc fork()
4434 // above.
4435 execve("/bin/sh", (char* const*)argv, environ);
4436
4437 // execve failed
4438 _exit(-1);
4439
4440 } else {
4441 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
4442 // care about the actual exit code, for now.
4443
4444 int status;
4445
4446 // Wait for the child process to exit. This returns immediately if
4447 // the child has already exited. */
4448 while (waitpid(pid, &status, 0) < 0) {
4449 switch (errno) {
4450 case ECHILD: return 0;
4451 case EINTR: break;
4452 default: return -1;
4453 }
4454 }
4455
4456 if (WIFEXITED(status)) {
4457 // The child exited normally; get its exit code.
4458 return WEXITSTATUS(status);
4459 } else if (WIFSIGNALED(status)) {
4460 // The child exited because of a signal
4461 // The best value to return is 0x80 + signal number,
4462 // because that is what all Unix shells do, and because
4463 // it allows callers to distinguish between process exit and
4464 // process death by signal.
4465 return 0x80 + WTERMSIG(status);
4466 } else {
4467 // Unknown exit code; pass it through
4468 return status;
4469 }
4470 }
4471 }
4472
4473 // is_headless_jre()
4474 //
4475 // Test for the existence of xawt/libmawt.so or libawt_xawt.so
4476 // in order to report if we are running in a headless jre
4477 //
4478 // Since JDK8 xawt/libmawt.so was moved into the same directory
4479 // as libawt.so, and renamed libawt_xawt.so
4480 //
4481 bool os::is_headless_jre() {
4482 struct stat statbuf;
4483 char buf[MAXPATHLEN];
4484 char libmawtpath[MAXPATHLEN];
4485 const char *xawtstr = "/xawt/libmawt" JNI_LIB_SUFFIX;
4486 const char *new_xawtstr = "/libawt_xawt" JNI_LIB_SUFFIX;
4487 char *p;
4488
4489 // Get path to libjvm.so
4490 os::jvm_path(buf, sizeof(buf));
4491
4492 // Get rid of libjvm.so
4493 p = strrchr(buf, '/');
4494 if (p == NULL) return false;
4495 else *p = '\0';
4496
4497 // Get rid of client or server
4498 p = strrchr(buf, '/');
4499 if (p == NULL) return false;
4500 else *p = '\0';
4501
4502 // check xawt/libmawt.so
4503 strcpy(libmawtpath, buf);
4504 strcat(libmawtpath, xawtstr);
4505 if (::stat(libmawtpath, &statbuf) == 0) return false;
4506
4507 // check libawt_xawt.so
4508 strcpy(libmawtpath, buf);
4509 strcat(libmawtpath, new_xawtstr);
4510 if (::stat(libmawtpath, &statbuf) == 0) return false;
4511
4512 return true;
4513 }
4514
4515 // Get the default path to the core file
4516 // Returns the length of the string
4517 int os::get_core_path(char* buffer, size_t bufferSize) {
4518 int n = jio_snprintf(buffer, bufferSize, "/cores");
4519
4520 // Truncate if theoretical string was longer than bufferSize
4521 n = MIN2(n, (int)bufferSize);
4522
4523 return n;
4524 }